# 少年法 / Juveniles Act — 附　則 (Supplementary Provisions) This is the Markdown twin of https://japanlaw.org/ja/juvenile-act/suppl-4201-71. Every law, and how to address a provision: https://japanlaw.org/llms.txt. The same laws as MCP tools (no sign-in): https://japanlaw.org/mcp. - Law: 少年法 (Juveniles Act), 昭和二十三年法律第百六十八号 - English title "Juveniles Act": Ministry of Justice translation - Kind: Act — the distinction between 法律 (Act), 政令 (Cabinet Order), 省令 (Ministerial Order) and 条例 (local ordinance) decides who may issue it and what it may say. - Provision: 附　則 (Supplementary Provisions) — address `suppl-4201-71` - Text in force since: 2026-06-24 - URL (the page that opens at this provision): https://japanlaw.org/ja/juvenile-act/suppl-4201-71 - Permanent URL (e-Gov law ID, never renamed): https://japanlaw.org/l/323AC0000000168/suppl-4201-71 - Every provision below carries its address and both URLs on the line under it. - Japanese text: e-Gov 法令検索, Digital Agency (デジタル庁). English: as marked on each line below. Only the Japanese as published by the government has legal effect; the text below is a copy of it. Every English rendering below is a translation and says which kind: the Ministry of Justice's translation, or this site's machine translation, whose model and date the Sources list names. They are never merged and never substituted for one another. --- ## 附　則 平成二〇年六月一八日法律第七一号 suppl-4201-71 · https://japanlaw.org/ja/juvenile-act/suppl-4201-71 · https://japanlaw.org/l/323AC0000000168/suppl-4201-71 **第一項** この法律は、公布の日から起算して六月を超えない範囲内において政令で定める日から施行する。ただし、第五条の二第一項の改正規定（「この項及び第三十一条の二において」を削る部分に限る。）及び第九条の二の改正規定は、公布の日から起算して二十日を経過した日から施行する。 suppl-4201-71/par-1 · https://japanlaw.org/ja/juvenile-act/suppl-4201-71/par-1 · https://japanlaw.org/l/323AC0000000168/suppl-4201-71/par-1 This Act comes into effect as of the day specified by Cabinet Order within a period not exceeding six months from the date of promulgation; provided, however, that the amending provisions of Article 5-2, paragraph (1) (limited to the portion deleting "in this paragraph and Article 31-2") and the amending provisions of Article 9-2 come into effect as of the day on which 20 days have elapsed from the date of promulgation. machine translation, not official **第二項** この法律の施行の日前にこの法律による改正前の少年法第三十七条第一項の規定により公訴の提起があった成人の刑事事件については、この法律による改正後の少年法、裁判所法（昭和二十二年法律第五十九号）及び刑事訴訟法（昭和二十三年法律第百三十一号）の規定にかかわらず、なお従前の例による。沖縄の復帰に伴う特別措置に関する法律（昭和四十六年法律第百二十九号）第二十六条第四項の規定により家庭裁判所が権限を有する成人の刑事事件についても、同様とする。 suppl-4201-71/par-2 · https://japanlaw.org/ja/juvenile-act/suppl-4201-71/par-2 · https://japanlaw.org/l/323AC0000000168/suppl-4201-71/par-2 With regard to adult criminal cases in which prosecution was instituted pursuant to the provisions of Article 37, paragraph (1) of the Juveniles Act prior to its amendment by this Act before the day on which this Act comes into effect, the provisions then in force continue to govern, notwithstanding the provisions of the Juveniles Act, the Courts Act (Act No. 59 of 1947), and the Code of Criminal Procedure (Act No. 131 of 1948) as amended by this Act; the same applies to adult criminal cases over which a family court has authority pursuant to the provisions of Article 26, paragraph (4) of the Act on Special Measures Incidental to Reversion of Okinawa (Act No. 129 of 1971). machine translation, not official **第三項** 政府は、この法律の施行後三年を経過した場合において、被害者等による少年審判の傍聴に関する規定その他この法律による改正後の規定の施行の状況について検討を加え、必要があると認めるときは、その結果に基づいて所要の措置を講ずるものとする。 suppl-4201-71/par-3 · https://japanlaw.org/ja/juvenile-act/suppl-4201-71/par-3 · https://japanlaw.org/l/323AC0000000168/suppl-4201-71/par-3 If three years have elapsed after this Act comes into effect, the government is to examine the status of enforcement of the provisions on observation of trial and decision by victims, etc. and other provisions as amended by this Act, and if it finds it necessary, take the necessary measures based on the results. machine translation, not official --- ## Cites - suppl-4201-71/par-2: 沖縄の復帰に伴う特別措置に関する法律（昭和四十六年法律第百二十九号）第二十六条第四項 → e-Gov law 346AC0000000129, 第二十六条第四項 (Article 26, paragraph (4)), art-26/par-4 — not held in this collection --- ## Sources - e-Gov 法令検索, Digital Agency (デジタル庁) — 少年法 — the text in force from 2026-06-24 (https://laws.e-gov.go.jp/law/323AC0000000168/20260624_508AC0000000046), retrieved 2026-11-02 - Japanese Law Translation Database System, Ministry of Justice (法務省) — Juveniles Act — Ministry of Justice translation (https://www.japaneselawtranslation.go.jp/en/laws/view/4827/tb), retrieved 2026-11-02 - claude-sonnet-5-5 — Machine translation, batch juvenile-act-20261102T172711-005, translated 2026-11-03 - claude-sonnet-5-5, corrected on review by claude-opus-5-5 — Machine translation corrected on review, batch juvenile-act-20261102T172711-005, translated 2026-11-03 - This site's parser, version 220 — 少年法 — structure, counts, cross-references and defined terms, computed 2026-11-02