Establishment of the Ministry of Munitions

By 1943 Japan was being pushed back across the Pacific and raising aircraft output had become the most urgent problem of the war economy. Yet materials mobilization plans were drawn up by the Planning Board, civilian industry was administered by the Ministry of Commerce and Industry, and orders for weapons and aircraft were placed separately by the Army and the Navy, which competed fiercely for materials and factories. To unify the administration of munitions production, the Tōjō cabinet decided on a sweeping reorganization of the central ministries.

The establishment of the Ministry of Munitions (軍需省) on November 1, 1943, under Imperial Ordinance No. 824, represented the most significant wartime reorganization of Japan's economic bureaucracy. The Commerce Ministry's industrial policy bureaus and the Planning Board's national mobilization division were merged into a single ministry tasked with directing all military-industrial production; the Commerce Ministry was abolished the same day and its remaining civilian business passed to the new Ministry of Agriculture and Commerce. The new ministry comprised the Minister's Secretariat and the General Mobilization, Aviation Weapons, Machinery, Iron and Steel, Light Metals, Non-Ferrous Metals, Chemical, Fuel and Electric Power bureaus, with eight regional munitions supervision offices around the country. PM Tōjō Hideki assumed the Minister of Munitions portfolio while already serving as PM and War Minister; day-to-day business was run by Kishi Nobusuke, who served as vice-minister with the rank of minister of state, and Shiina Etsusaburō headed the General Mobilization Bureau.

The ministry worked in tandem with the Munitions Companies Act (軍需会社法), promulgated in October 1943 and brought into force in December. The Act required designated firms to 'respond to the demands of the state, exert their full strength and carry out munitions work with responsibility'; the government could dismiss a company's 'production supervisor' and order changes to its articles, managers were given official status, and employees were treated as conscripted labour who could not freely quit. The Act designated approximately 150 major corporations, chiefly in the aircraft industry, as state-directed munitions producers, later expanded to over 600: within fiscal 1944 a further 424 firms in metals, coal mining, electric power and other fields and another 109 were added, for a total of 683. English Wikipedia and similar accounts state that Tōjō's assumption of the Munitions portfolio and the ministry itself were inspired partly by the centralized war production model of Nazi Germany's armaments ministry under Fritz Todt and Albert Speer; the Japanese sources consulted here do not corroborate this, and it is best treated as one interpretation.

Tōjō left office when his cabinet resigned in July 1944, and the portfolio changed hands several times, the last minister being Nakajima Chikuhei. Despite the formal centralization, Army-Navy rivalry and shortages of materials and shipping persisted, and with the added damage from American air raids munitions output declined from the second half of 1944. The ministry was abolished on 26 August 1945 and reverted to the Ministry of Commerce and Industry, later reorganized as the Ministry of International Trade and Industry.