On 15 July 2026, Japan’s House of Representatives passed a bill letting the government designate a second capital outside Tokyo as a contingency. Nine days later, the House of Councillors enacted the law by 123 votes to 121 after a compromise between the ruling and opposition camps. Japan has, after decades of hesitation, created a statutory mechanism for the continuity of government during disasters. But the substance is thin.
The hazard this law aims to address is real. Japan’s risk assessments forecast the probability of a magnitude-7 class earthquake striking the region where Tokyo is located at 70 per cent within the next 30 years. The last comparable event happened in 1923 and killed over 100,000 people.
The Greater Tokyo area houses close to 30 per cent of Japan’s population and a similar share of its GDP. Nearly every ministry sits a few kilometres from the Bank of Japan and the Tokyo Stock Exchange. Seismologists have flagged these grounds as risky.
The new law addresses exposure only at the margins. It permits the government to designate a backup seat of government. Candidate prefectures are assessed on population size, economic scale and administrative readiness, with no site yet named. That vagueness echoes an old ambiguity. Japan has never had a statute explicitly naming Tokyo the capital either, only laws defining a ‘capital area’ around it. Tokyo’s primacy was already settled in practice, backed by a century of bureaucratic, financial and corporate infrastructure. A designated backup capital carries no such weight. Without a named site, funded infrastructure or a binding trigger, prefectures can angle for the symbolic label while doing little else.
