In Japan, three layers must be resolved before any number can be applied correctly.
日本の労働時間法制は三層構造 — 適用対象・制度選択が決まって初めて、数値が意味を持つ
PUBLISHED JULY 20266 MIN READLSA ARTS. 32 · 36 · 37 · 40 · 41
THE STRUCTURE · 三層構造RESOLVE TOP-DOWN — LAYER 3 IS UNREACHABLE UNTIL 1 AND 2 ARE FIXED
1
Who is covered適用対象
Workplace 事業場 · industry · headcount · Art. 41 exclusions → decides whether the rules reach this person at all
2
Which regime applies労働時間制度
Standard · Variable · Flextime · Discretionary · Highly Professional → decides what counts as a day, a week, and an hour of overtime
3
The numbers数値
8 / 40 · +25% · 22–05 · +35% → valid only under a fixed Layer 1 + Layer 2 path
A flat list of working-time rules is not sufficient for Japan. The statutory figures at Layer 3 are real, but they are only reachable through two upstream layers that determine who is covered and which working-time regime the employer has adopted.
Resolve those first, or a rule can be individually accurate and still produce a wrong result — correct figures applied to people the figures were never reachable for.
1
Who is covered
RESOLVES AT THE WORKPLACE, NOT THE COMPANY
Workplace (事業場) is the relevant unit — different workplaces in the same company may sit under different rules. Industry and headcount can change the weekly statutory limit itself, not just the paperwork.
ART. 41(2)
Workers in positions of supervision or management 管理監督者 — provisions on working hours, breaks and days off do not apply; premium wages for night work still do. Tested on actual authority, not job title.
ART. 41(1)
Agriculture, livestock and fisheries — the provisions on working hours, breaks and days off do not apply.
ART. 116(2)
Domestic workers — outside the Act entirely.
ART. 41(3)
Monitoring / intermittent work — excluded, but only with prior permission from the relevant government agency.
The regime decides what counts as a working day, a working week, and an hour of overtime for this person.
StandardThe daily and weekly limits apply as written.
Variable working hours 変形Averaged over 1 week, 1 month or 1 year; busy and slack periods must be fixed in advance.
FlextimeSettlement period up to 3 months; overtime is calculated over the period, with an additional monthly 50-hour weekly-average test when it exceeds one month.
Discretionary 裁量Working hours are deemed for statutory calculation. Limited to designated work categories.
Highly ProfessionalWorking hours, breaks, days off and night-work premium all disapplied. Requires a four-fifths committee resolution, notification, and the worker’s consent. Art. 41-2
The Article 36 agreement is, as a general rule, a precondition for overtime work or work on days off. Paying the premium wage does not, by itself, make unauthorized overtime lawful. Art. 36
3
The numbers
VALID ONLY UNDER A FIXED LAYER 1 + 2 PATH
8 / 40
Statutory limits per day / week. Art. 32 — a 44 h/week special provision applies to certain businesses usually employing fewer than 10 workers.
+25%
Premium wages for overtime. Art. 37 — at least +50% for overtime exceeding 60 hours in one month.
22–05
Night work, 10 p.m.–5 a.m. Premium of at least +25%. Survives the Art. 41 exclusions — but not the Highly Professional System. Art. 37(4)
+35%
Work on a statutory day off. Applies to a day off under Art. 35, not every scheduled non-working day.
WHAT THIS MEANS FOR YOUR POLICY
Layers 1 and 2 are not footnotes to the rules — they are input variables.
A Japan rule set carrying only Layer 3 will be accurate rule by rule and wrong in aggregate, because it applies correct figures to people the figures were never reachable for. Each rule needs an applicability tag — which workplace conditions, and which regime, it is valid under — before rule-by-rule validation is meaningful.
WHO WRITES THESE
Wakana Chiba, Tokutei Sharoushi
Licensed Labor and Social Security Attorney in Japan
Wakana Chiba is a Tokutei Sharoushi — a nationally qualified and registered Labor and Social Security Attorney in Japan. She advises employers on Japanese employment law, workplace rules, working time, employment documentation, and labor and social insurance procedures, translating complex statutory requirements into policies and operations that work in practice.
Legal analysis and review of Japanese primary sources are performed by Wakana Chiba. English terminology is checked against the Japanese Law Translation Database and official MHLW materials. While AI may be used to draft initial texts, all published conclusions have been reviewed by the author.
TSUKURU-HR.COM / GLOBAL · COOKIE POLICYLSA = LABOR STANDARDS ACT 労働基準法 · STATUTORY POSITION AS OF JULY 2026 · GENERAL INFORMATION, NOT LEGAL ADVICE
