Morinaga Milk Industry

The arsenic milk disaster and a permanent framework for relief (1974)

Key decision·1974· Morinaga Milk Industry — the full company history →

When is responsibility complete?

The heart of this decision lay in how a company takes on responsibility for large-scale harm caused by its own product. Between the contamination and the disclosure there was an absence of inspection; in the fourteen years after the disclosure, forces worked to make the harm look smaller than it was. What broke that silence was the victims themselves, and the persistent investigation of the experts and citizens who stood beside them. That the acceptance of responsibility arrived not from the occurrence of the harm but only after society re-opened the question is the measure of how heavy this case is.

A framework in which the company that caused the harm carries relief in perpetuity was without precedent at the time, and has since been looked back on as one origin of Japan’s later product-liability law and consumer-protection debate. Yet lifetime relief takes on, as time passes, new symptoms and burdens no one could foresee at the outset. Disputes still running seventy years later leave open the question of how far a relief promise, once concluded, can keep pace with the reality of the harm. Does responsibility for the damage a company causes end when the agreement is signed, or does it stay in question for as long as the harm continues — the arsenic milk disaster still marks that boundary.

Revenue and net margin, FY1969–FY1979

Revenue in ¥ bn (bars) and net margin in % (line), for the years around the decision. Shaded columns are FY1974 onwards — after it was taken.

Source: securities reports

Read the full dossier in Japanese →

The Japanese edition carries the complete record of this decision — the situation that forced it, the options weighed, what actually followed, and the sources behind every claim.

Other key decisions at Morinaga Milk Industry


Yen amounts are converted at the average rate of each figure’s own year — not today’s rate; the revenue chart is shown in yen. Exchange rates & sources — the full ¥/US$ table →


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Data API

Morinaga Milk Industry’s history, financials, executives and shareholders are published as static JSON — no key, plain GET. Full specification →

Method Endpoint Returns
GET /api/companies.json All companies
GET /api/2264/manifest.json Resource index
GET /api/2264/history.json History overview
GET /api/2264/timeline.json Chronology
GET /api/decisions.json All management decisions (index)
GET /api/2264/decisions.json Management decisions (index)
GET /api/2264/decisions/{slug}.json One decision (full dossier)
GET /api/2264/executives.json Executives
GET /api/2264/shareholders.json Major shareholders
GET /api/2264/financials.json Financial statements
GET /api/2264/financials-longterm.json Long-term results
GET /api/2264/segments.json Business segments
GET /api/2264/regions.json Sales by region
GET /api/2264/workforce.json Workforce