{ "id": "epqy061sq6", "slug": "parasite-single", "title": "Parasite single", "updated": "2026-10-25", "topic_path": [ { "id": "society", "label": "Society and history", "api_url": "https://www.edgepedia.org/api/v1/topics/society" }, { "id": "society.people", "label": "Social life and human behavior", "api_url": "https://www.edgepedia.org/api/v1/topics/society.people" }, { "id": "society.people.relationships", "label": "Relationships and social issues", "api_url": "https://www.edgepedia.org/api/v1/topics/society.people.relationships" }, { "id": "society.people.relationships.kinship_family", "label": "Kinship and family", "api_url": "https://www.edgepedia.org/api/v1/topics/society.people.relationships.kinship_family" }, { "id": "society.people.relationships.family_structure", "label": "Family structure and change", "api_url": "https://www.edgepedia.org/api/v1/topics/society.people.relationships.family_structure" }, { "id": "society.people.relationships.family_structure.cohabitation_singlehood_and_chosen_family", "label": "Cohabitation, singlehood, and chosen family", "api_url": "https://www.edgepedia.org/api/v1/topics/society.people.relationships.family_structure.cohabitation_singlehood_and_chosen_family" } ], "geo": [ { "id": "geo.asia.t1946.society.people", "label": "Asia (other) · 1946 to 2000: Social life and human behavior", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.asia.t1946.society.people", "path": [ { "id": "geo.asia", "label": "Asia (other)", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.asia" }, { "id": "geo.asia.t1946", "label": "Asia (other) · 1946 to 2000", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.asia.t1946" }, { "id": "geo.asia.t1946.society", "label": "Society and history", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.asia.t1946.society" }, { "id": "geo.asia.t1946.society.people", "label": "Social life and human behavior", "api_url": "https://www.edgepedia.org/api/v1/geo/geo.asia.t1946.society.people" } ] } ], "excerpt": "Parasite single (パラサイトシングル) is a Japanese pejorative for unmarried adults living off their parents' household, coined by sociologist Masahiro Yamada in 1997 and popularized by his 1999 book.", "snippet": "Parasite single (パラサイトシングル) is a Japanese pejorative for unmarried adults living off their parents' household, coined by sociologist Masahiro Yamada in 1997 and popularized by his 1999 book.", "node": "society.people.relationships.family_structure.cohabitation_singlehood_and_chosen_family", "markdown": "# Parasite single\n\nA **parasite single** (パラサイトシングル) is a pejorative Japanese term for an unmarried adult, usually in their twenties or thirties, who continues to live with economically comfortable parents after finishing school and finding work, remaining financially dependent while avoiding the adult transitions of marriage and an independent household. The sociologist Masahiro Yamada coined the term in a 1997 newspaper article and developed it in his 1999 book *The Age of Parasite Singles* (パラサイト・シングルの時代), published by Chikuma Shinsho.[1](https://www.nippon.com/en/in-depth/a01002/) • [2](https://www.jstage.jst.go.jp/article/afs/45/0/45_27/_article) • [3](https://kotobank.jp/word/%E3%81%B1%E3%82%89%E3%81%95%E3%81%84%E3%81%A8%E3%81%97%E3%82%93%E3%81%90%E3%82%8B-3216364)\n\n| Key fact | Detail |\n|---|---|\n| Definition | An unmarried person who, even after graduation and employment, does not become economically independent and lives with parents, appearing to parasitize them as a host[3](https://kotobank.jp/word/%E3%81%B1%E3%82%89%E3%81%95%E3%81%84%E3%81%A8%E3%81%97%E3%82%93%E3%81%90%E3%82%8B-3216364) |\n| Coinage | Masahiro Yamada, then associate professor at Tokyo Gakugei University, first used the term in a February 1997 article in the Nihon Keizai Shimbun[1](https://www.nippon.com/en/in-depth/a01002/) |\n| Scale, 1980–2000 | Unmarried people aged 20–34 living with their parents increased from 8.17 million to 11.7 million[4](https://onlinelibrary.wiley.com/doi/10.1111/j.1475-6781.2008.00109.x) |\n| Co-residence rates, 1980–2005 | 23.9% to 42.6% for ages 25–29 and 7.6% to 24.0% for ages 30–34; higher for men than women[5](https://www.researchgate.net/publication/249017170_Baby-boomers_Baby-busters_and_the_Lost_Generation_Generational_Fractures_in_Japan%27s_Homeowner_Society) |\n| Estimated total | More than 13 million by 2006[6](https://mail.japanesestudies.org.uk/discussionpapers/2006/Tran.html) |\n| Living costs | In large Japanese cities, rent and living costs can approach 150,000 yen a month, against an average monthly salary of about 200,000 yen for working women aged 25–29[7](https://web-japan.org/trends00/honbun/tj000508.html) |\n\n## Origin and meaning\n\nYamada, a sociologist at Tokyo Gakugei University, introduced the term in 1997 and later wrote that he coined it because most unmarried adults who stayed at home seemed to have practically a parasitic existence.[1](https://www.nippon.com/en/in-depth/a01002/) Japanese dictionaries define it as an unmarried young person co-residing with economically comfortable parents, with special reference to unmarried women, and note that the image is of a person living off the parents as a host.[3](https://kotobank.jp/word/%E3%81%B1%E3%82%89%E3%81%95%E3%81%84%E3%81%A8%E3%81%97%E3%82%93%E3%81%90%E3%82%8B-3216364) The term itself is gender-neutral, though it has been applied mostly to women who choose to remain single while in the workforce.[8](https://espace.curtin.edu.au/bitstream/handle/20.500.11937/2068/16771_DasguptaPhD.pdf?isAllowed=y&sequence=2)\n\nThe 1999 book argued that young adults stay at the parental home because, on low salaries in a stagnating economy, they believe they cannot live an affluent life by themselves; remaining with parents lets them enjoy a comfortable single life on their own earnings.[4](https://onlinelibrary.wiley.com/doi/10.1111/j.1475-6781.2008.00109.x)\n\n## Scale of the phenomenon\n\n**Numbers.** In 1995, a majority of single men and women aged 20 to 24 in Japan lived with their parents, and about 40% of men and 35% of women aged 25 to 29 still did; among unmarried people aged 20 to 34, only 40% of men and 20% of women lived alone.[7](https://web-japan.org/trends00/honbun/tj000508.html) Measured as unmarried people aged 20–34 living with parents, the count rose from 8.17 million in 1980 to 11.7 million in 2000.[4](https://onlinelibrary.wiley.com/doi/10.1111/j.1475-6781.2008.00109.x) Between 1980 and 2005 the share of co-residing singles rose from 23.9% to 42.6% at ages 25–29 and from 7.6% to 24.0% at ages 30–34.[5](https://www.researchgate.net/publication/249017170_Baby-boomers_Baby-busters_and_the_Lost_Generation_Generational_Fractures_in_Japan%27s_Homeowner_Society) By 2006 the population was commonly estimated at more than 13 million.[6](https://mail.japanesestudies.org.uk/discussionpapers/2006/Tran.html) International comparisons cited in the research literature put Japan at the highest ratio in the world of single young adults living at home with their parents.[6](https://mail.japanesestudies.org.uk/discussionpapers/2006/Tran.html)\n\nThe phenomenon grew out of specific economic conditions. The parents' generation worked during Japan's rapid-growth era, is relatively well off, and many own their own homes, so they can support adult children and often see no need to push them out.[7](https://web-japan.org/trends00/honbun/tj000508.html) On the children's side, city rent and living costs of nearly 150,000 yen a month are hard to manage on the roughly 200,000 yen average monthly salary of working women aged 25–29.[7](https://web-japan.org/trends00/honbun/tj000508.html)\n\n## The theory and its critics\n\nYamada framed co-residence as a choice: parasite singles use their disposable income for travel, designer goods, and a comfortable lifestyle while parents cover meals, laundry, and housecleaning.[7](https://web-japan.org/trends00/honbun/tj000508.html) • [1](https://www.nippon.com/en/in-depth/a01002/) He identified the parents themselves as a cause, and suggested remedies such as financial incentives to lure adult children out of the parental home and encourage parents to foster independence.[6](https://mail.japanesestudies.org.uk/discussionpapers/2006/Tran.html)\n\n**Demographic critique.** The demographer Makoto Atoh of Waseda University accepted the count increase but disputed its interpretation: the number of parasite singles grew mainly because the proportion of never-married young people rose sharply, not because never-married people became much more likely to stay at their parents' home.[4](https://onlinelibrary.wiley.com/doi/10.1111/j.1475-6781.2008.00109.x) He also argued the phenomenon cannot be the main reason for Japan's declining fertility, since the marriage postponement behind low fertility had continued since the mid-1970s.[4](https://onlinelibrary.wiley.com/doi/10.1111/j.1475-6781.2008.00109.x) On Yamada's own account, a very large share of unmarried Japanese nonetheless hoped to marry, remaining at the high 90% level even as the unmarried rate climbed.[1](https://www.nippon.com/en/in-depth/a01002/)\n\n**Scope critique.** A 2006 review of parasite single theories argued that Yamada's account, by limiting the cause to the parents and treating co-residence as voluntary, misses subgroups such as hikikomori (shut-ins) and other contributing factors, and so gives an incomplete explanation.[6](https://mail.japanesestudies.org.uk/discussionpapers/2006/Tran.html)\n\n## Legacy in research and in Korea\n\nKeiko Tanaka of Keio University, reviewing mid-life parent-child relationship research since the 1990s, found that the parasite single theory influenced several areas of family studies, including family change theory, modern family theory, and exchange theory.[2](https://www.jstage.jst.go.jp/article/afs/45/0/45_27/_article) Her review proposes re-examining basic presuppositions such as co-residence and its rate, building theoretical explanations centered on mid-life parent-child relationships, and improving approaches to middle-aged and older single people, especially single men and only children in unstable employment.[2](https://www.jstage.jst.go.jp/article/afs/45/0/45_27/_article)\n\nThe concept traveled beyond Japan. A 2021 survey of 30 single office workers in their thirties in Seoul found that many considered themselves not yet financially independent despite graduating and finding jobs, that they unilaterally received services from parents while being almost exempted from household roles, and that parents' satisfaction with co-residence was relatively high.[9](https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11329324) Korean commentary has used the same term for unmarried adults who keep depending on their parents economically after reaching the age of independence.[10](https://chunchu.yonsei.ac.kr/news/articleView.html?idxno=19353)\n\n## References\n\n1. [Masahiro Yamada, \"Japan's Deepening Social Divides,\" Nippon.com](https://www.nippon.com/en/in-depth/a01002/)\n2. [Keiko Tanaka (2020). \"Results and Challenges of the Parasite Singles Theory,\" Annals of Family Studies 45, 27–42](https://www.jstage.jst.go.jp/article/afs/45/0/45_27/_article)\n3. [Kotobank: パラサイトシングル (Daijisen; Seisenban Nihon Kokugo Daijiten)](https://kotobank.jp/word/%E3%81%B1%E3%82%89%E3%81%95%E3%81%84%E3%81%A8%E3%81%97%E3%82%93%E3%81%90%E3%82%8B-3216364)\n4. [Makoto Atoh (2008). \"Family Changes in the Context of Lowest-Low Fertility: The Case of Japan,\" International Journal of Japanese Sociology 17(1)](https://onlinelibrary.wiley.com/doi/10.1111/j.1475-6781.2008.00109.x)\n5. [Hirayama, \"Baby-boomers, Baby-busters and the Lost Generation: Generational Fractures in Japan's Homeowner Society\"](https://www.researchgate.net/publication/249017170_Baby-boomers_Baby-busters_and_the_Lost_Generation_Generational_Fractures_in_Japan%27s_Homeowner_Society)\n6. [Mariko Tran (2006). \"Unable or Unwilling to Leave the Nest? An Analysis and Evaluation of Japanese Parasite Single Theories,\" ejcjs Discussion Paper 5](https://mail.japanesestudies.org.uk/discussionpapers/2006/Tran.html)\n7. [\"Parasite Singles Multiply: And Parental Hosts Don't Seem to Mind,\" Trends in Japan, May 2000](https://web-japan.org/trends00/honbun/tj000508.html)\n8. [Fujimura-Fanselow / Dasgupta PhD thesis, Curtin University](https://espace.curtin.edu.au/bitstream/handle/20.500.11937/2068/16771_DasguptaPhD.pdf?isAllowed=y&sequence=2)\n9. [Kim Hyunju, Heo Jeongmu (2021). \"Awareness of Lifestyle and Independence of Parasite Singles,\" Asia-Pacific Convergence Research Exchange 7(12)](https://www.dbpia.co.kr/journal/articleDetail?nodeId=NODE11329324)\n10. [Yonsei Chunchu, \"Singlet types in focus: Parasite Single\"](https://chunchu.yonsei.ac.kr/news/articleView.html?idxno=19353)\n\n---\n*Topic: Encyclopedia › Society and history › Social life and human behavior › Relationships and social issues › Kinship and family › Family structure and change › Cohabitation, singlehood, and chosen family*\n\n*Initially written Sep 17, 2026 · Reviewed: Oct 25, 2026 · Edited: Oct 11, 2026; Oct 15, 2026; Oct 25, 2026 · Last review: Oct 25, 2026*\n\n*Copyright 2026 EdgeChat AI, a subsidiary of Biostate AI.*\n\nLicense: Edgepedia Community License 1.0, https://www.edgepedia.org/edgepedia/license\n", "same_as": [], "url": "https://www.edgepedia.org/parasite-single", "markdown_url": "https://www.edgepedia.org/parasite-single.md", "license": { "name": "Edgepedia Community License 1.0", "url": "https://www.edgepedia.org/edgepedia/license", "summary": "Free with credit, commercial use included. AI training is open to everyone. For other uses, organizations over USD 100M in revenue or 100M monthly users license separately.", "spdx": "LicenseRef-Edgepedia-Community-1.0" }, "credit": "\"Parasite single\", Edgepedia (EdgeChat), https://www.edgepedia.org/parasite-single. Edgepedia Community License 1.0.", "credit_md": "\"[Parasite single](https://www.edgepedia.org/parasite-single)\", Edgepedia (EdgeChat), [https://www.edgepedia.org/parasite-single](https://www.edgepedia.org/parasite-single). [Edgepedia Community License 1.0](https://www.edgepedia.org/edgepedia/license).", "credit_html": "\"Parasite single\", Edgepedia (EdgeChat), https://www.edgepedia.org/parasite-single. Edgepedia Community License 1.0.", "speakable": "Parasite single is a Japanese pejorative for unmarried adults living off their parents' household, coined by sociologist Masahiro Yamada in 1997 and popularized by his 1999 book." }