Seven Years of LGBTQ and Partnership Ordinance Debate — Regional Diffusion of Sexual Minority Discourse in Japanese Local Assemblies

This article uses the assembly-minutes dataset built at the machikarte Lab (containing over one million speech records as of 2024) to aggregate, by year and prefecture, speeches containing terms such as "LGBTQ," "LGBT," "partnership ordinance" (patonashippu seido), "sexual minority" (sei-teki mainoriti / sei-teki shōsūsha), "sexual orientation," and "gender identity." The aim is to read the time structure and regional diffusion of sexual minority–related debate. Evaluating individual assemblies or individual councillors is outside the article's scope.

Over the seven years from 2018 to 2024, LGBTQ-related-term mentions in Japanese local assemblies show a sustained upward trajectory. From 2018 to 2020 growth was gradual; after 2021 the pace of increase accelerated; and by 2024 annual mention counts had reached several times the 2018 level.

The increase can be read as a two-stage structure. The first stage — 2018 to 2020 — was a period of gradual growth, coinciding with the wave of municipal scheme adoptions that followed Shibuya Ward and Setagaya Ward's partnership-declaration systems (2015). The second stage — from 2021 onward — was an acceleration phase, corresponding to the legislative trajectory of the Act for the Promotion of Public Understanding of Sexual Orientation and Gender Identity and the nationwide diffusion of partnership recognition schemes, both of which drove assembly agendas sharply upward.

Comparing per-municipality mention density (mentions per municipality) for the single year 2024 across prefectures, a roughly sixfold gap exists between the top and bottom groups. Prefectures hosting multiple early-adopter municipalities show higher mention density, though other factors also appear to be at work.

The enactment process of the Act for Understanding

The Act for the Promotion of Public Understanding of Sexual Orientation and Gender Identity (Act No. 68 of 2023) surfaced as a legislative proposal in 2021, but negotiations between the ruling and opposition parties proved protracted, and the Act was finally enacted in June 2023. This legislative trajectory is considered one of the major external drivers of the sharp rise in assembly mentions after 2021.

The spread of partnership recognition schemes preceded the enactment of the Act. According to the Research Institute of Local Government, a movement in which municipalities independently establish partnership-declaration systems and ordinances has continued since 2015; as of June 2024, 459 municipalities have adopted schemes, covering over 85% of the national population.

Vocabulary diversity and aggregation caveats

LGBTQ-related-term aggregation is highly sensitive to vocabulary selection. Related terms such as "sexual minority" (sei-teki shōsūsha), "same-sex couple," "sexuality minority" (sekushuaru mainoriti), and "gender" are not included in the regular expression used here. Additionally, the term "gender identity" (sei jinin) has significant contextual overlap with gender-recognition debates, women's advancement policy, and public-bathing-facility discussions, meaning that speeches outside LGBTQ discourse may be captured in the count.

Given the surface-keyword nature of this aggregation, the figures in this article represent the number of speeches in which LGBTQ-related terms appeared — not the number of speeches delivered from a position of support or promotion. Speeches for and against are counted equally.

Reading the regional variation

The roughly sixfold gap in prefecture-level mention density has multiple interpretive paths. In municipalities that adopted partnership schemes early, pre-adoption deliberations, post-adoption performance reviews, and scheme-expansion discussions continuously generate mentions. Where a prefecture has itself enacted an ordinance, mentions from the prefectural assembly are added to the total. Population size and differences in the scope of coverage also affect density.

Timing of legislative ripple effects on assembly discourse

The acceleration after 2021 coincides with the legislative trajectory of the Act for Understanding, suggesting a structural pattern in which national legislative processes set the agenda for local assemblies in advance. Compared with fiscal-soundness discussions (trends-fiscal-health-2018-2024) and young-carer discussions (trends-young-carer-2018-2024), LGBTQ discourse belongs to the category of policy vocabulary that diffuses fastest.

The relationship between partnership scheme diffusion and assembly debate

The correspondence between the scheme-adoption curve and the mention-count curve may work in both directions — "scheme adoption generates discussion" and "discussion promotes scheme adoption." After 2021, the pace of adoption accelerated and assembly mentions appear to have moved in tandem, though the direction of causality cannot be determined from this aggregation alone.

Intersection with the deferred-response structure

The extent to which administrative responses to councillor questions about LGBTQ issues and partnership schemes include "under consideration" (kentō) phrasing can be measured by combining this dataset with the deferred-response analysis (case-sakiokuri-rate). Whether assemblies with high LGBTQ discussion show correspondingly high "under consideration" reservation rates would serve as an indicator of the actual state of municipal policy response.

• No separation of stance: speeches containing LGBTQ-related terms include pro-scheme, anti-scheme, and neutral explanatory positions — no position-based classification has been applied
• Vocabulary coverage limits: related terms such as "sexuality minority" and "same-sex couple" are not included
• No separation of speakers: councillor questions and administrative responses are not distinguished
• Coverage bias: year-on-year changes in the number of municipalities recorded affect absolute counts
• No individual naming: this article stays at the structural level and does not publish municipality-level or councillor-level rankings

The query specification used for aggregation (spec_version v1-lgbtq-2026-07) is documented at the end of this article, and the BigQuery aggregation queries will be placed in the machikarte GitHub repository.

Aggregation queries (spec_version v1-lgbtq-2026-07)

Year-by-year trend (2018–2024):

SELECT
  year,
  COUNT(*) AS lgbtq_mentions,
  COUNT(DISTINCT municipality_code) AS municipalities
FROM `correlate-workspace.isvd_machikarte.speeches`
WHERE year BETWEEN 2018 AND 2024
  AND REGEXP_CONTAINS(body, r'(LGBT|LGBTQ|パートナーシップ制度|性的マイノリティ|性的少数者|性自認|同性パートナー|同性婚)')
GROUP BY year
ORDER BY year

Act for the Promotion of Public Understanding of Sexual Orientation and Gender Identity (Act No. 68 of 2023) — Cabinet Secretariat. e-Gov Laws and Regulations

Ordinances on Gender Diversity — Ordinance Trends — Research Institute of Local Government. Research Institute of Local Government

Status of Partnership-Related Schemes — Gender Equality Bureau, Cabinet Office. Gender Equality Bureau, Cabinet Office

machikarte — Nationwide Local Assembly Speech Search Platform (Beta) — Institute for Social Vision Design (ISVD). ISVD

machikarte (GitHub) — schema, aggregation queries, licenses (MIT + CC BY 4.0) — Institute for Social Vision Design (ISVD). GitHub

Verification of Role Classification Methods for Diet Records Using BERT-Based Classifiers (in Japanese) — Miyaki, Y. and Uchida, Y.. Journal of Japan Society for Fuzzy Theory and Intelligent Informatics, Vol. 37, No. 1, pp. 530-534