# 厚生年金保険法施行令 / Order for Enforcement of the Employees' Pension Insurance Act — 第三条の十二の十二 (Article 3-12-12)

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- 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: 第三条の十二の十二 (Article 3-12-12)（特定期間に係る被保険者期間の計算） — address `art-3-12-12`
- Text in force since: 2026-10-01
- URL (the page that opens at this provision): https://japanlaw.org/ja/employees-pension-insurance-act-enforcement-order/art-3-12-12
- 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
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They are never merged and never substituted for one another.

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### 第三条の十二の十二（特定期間に係る被保険者期間の計算） — Calculation of the Insured Period Relating to the Specific Period
<sup>caption: machine translation, not official</sup>
<sup>art-3-12-12 · https://japanlaw.org/ja/employees-pension-insurance-act-enforcement-order/art-3-12-12</sup>

**第一項**  特定期間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、特定期間の初日の属する月はこれに算入し、特定期間の末日の属する月はこれに算入しない。ただし、特定期間の初日と末日が同一の月に属するときは、その月は、特定期間に係る被保険者期間に算入しない。
<sup>art-3-12-12/par-1 · https://japanlaw.org/ja/employees-pension-insurance-act-enforcement-order/art-3-12-12/par-1</sup>
With regard to the insured period relating to the specific period, as specified by Order of the Ministry of Health, Labour and Welfare, the month that includes the first day of the specific period is included in it, and the month that includes the last day of the specific period is not included in it; provided, however, that where the first day and the last day of the specific period fall in the same month, that month is not included in the insured period relating to the specific period.
<sup>machine translation, not official</sup>

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## 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-20261106T164949-008, 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