# 厚生年金保険法施行令 / Order for Enforcement of the Employees' Pension Insurance Act — 第三条の十二の四 (Article 3-12-4) This is the Markdown twin of https://japanlaw.org/en/employees-pension-insurance-act-enforcement-order/art-3-12-4. 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: 厚生年金保険法施行令 (Order for Enforcement of the Employees' Pension Insurance Act), 昭和二十九年政令第百十号 - English title "Order for Enforcement of the Employees' Pension Insurance Act": claude-opus-5-5 - Kind: CabinetOrder — 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: 第三条の十二の四 (Article 3-12-4)（対象期間に係る被保険者期間の計算） — address `art-3-12-4` - Text in force since: 2026-10-01 - URL (the page that opens at this provision): https://japanlaw.org/en/employees-pension-insurance-act-enforcement-order/art-3-12-4 - e-Gov law ID: 329CO0000000110 — never renamed. A permanent link, `/l/{lawId}/{address}` on this site, redirects to the page. - Every provision below carries its address and its URL 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. --- ### 第三条の十二の四（対象期間に係る被保険者期間の計算） — Calculation of the Insured Period Relating to the Subject Period caption: machine translation, not official art-3-12-4 · https://japanlaw.org/en/employees-pension-insurance-act-enforcement-order/art-3-12-4 **第一項** 対象期間標準報酬総額（法第七十八条の三第一項に規定する対象期間標準報酬総額をいう。次条において同じ。）を計算する場合における対象期間（法第七十八条の二第一項に規定する対象期間をいう。以下この条及び次条において同じ。）に係る被保険者期間については、厚生労働省令で定めるところにより、対象期間の初日の属する月が被保険者期間であるときはその月をこれに算入し、対象期間の末日の属する月が被保険者期間であるときはその月をこれに算入しない。ただし、対象期間の初日と末日が同一の月に属するときは、その月は、対象期間に係る被保険者期間に算入しない。 art-3-12-4/par-1 · https://japanlaw.org/en/employees-pension-insurance-act-enforcement-order/art-3-12-4/par-1 In the case of calculating the aggregate amount of standardized remuneration for the subject period (meaning the aggregate amount of standardized remuneration for the subject period prescribed in Article 78-3, paragraph (1) of the Act; the same applies in the following Article), with regard to the insured period relating to the subject period (meaning the subject period prescribed in Article 78-2, paragraph (1) of the Act; the same applies hereinafter in this Article and the following Article), as specified by Order of the Ministry of Health, Labour and Welfare, where the month that includes the first day of the subject period is an insured period, that month is included in it, and where the month that includes the last day of the subject period is an insured period, that month is not included in it; provided, however, that where the first day and the last day of the subject period fall in the same month, that month is not included in the insured period relating to the subject period. machine translation, not official --- ## Cites - art-3-12-4/par-1: 法第七十八条の三第一項 → 厚生年金保険法 第七十八条の三第一項 (Article 78-3, paragraph (1)), art-78-3/par-1 — https://japanlaw.org/en/employees-pension-insurance-act/art-78-3/par-1 (e-Gov law ID 329AC0000000115) - art-3-12-4/par-1: 次条 → 厚生年金保険法施行令 第三条の十二の五 (Article 3-12-5), art-3-12-5 — https://japanlaw.org/en/employees-pension-insurance-act-enforcement-order/art-3-12-5 - art-3-12-4/par-1: 法第七十八条の二第一項 → 厚生年金保険法 第七十八条の二第一項 (Article 78-2, paragraph (1)), art-78-2/par-1 — https://japanlaw.org/en/employees-pension-insurance-act/art-78-2/par-1 (e-Gov law ID 329AC0000000115) - art-3-12-4/par-1: この条 → 厚生年金保険法施行令 第三条の十二の四 (Article 3-12-4), art-3-12-4 — https://japanlaw.org/en/employees-pension-insurance-act-enforcement-order/art-3-12-4 ## Cited by 1 provision cites this one. No official source publishes this direction. - 厚生年金保険法施行令 第三条の十二の四第一項（対象期間に係る被保険者期間の計算） — https://japanlaw.org/en/employees-pension-insurance-act-enforcement-order/art-3-12-4/par-1 --- ## Sources - claude-opus-5-5 — English title of a law in this collection, written for this site, written 2026-11-06 - e-Gov 法令検索, Digital Agency (デジタル庁) — 厚生年金保険法施行令 — the text in force from 2026-10-01 (https://laws.e-gov.go.jp/law/329CO0000000110/20261001_508CO0000000276), retrieved 2026-11-06 - claude-sonnet-5-5 — Machine translation, batch employees-pension-insurance-act-enforcement-order-20261106T164949-007, translated 2026-11-08 - This site's parser, version 229 — 厚生年金保険法施行令 — structure, counts, cross-references and defined terms, computed 2026-11-06