Former Ministry of Commerce & Industry → Ministry of Munitions Site (METI Building)

The Ministry of Munitions (軍需省, Gunjushō) was a cabinet-level ministry of the Empire of Japan established on November 1, 1943 (Shōwa 18) by Imperial Ordinance No. 824 (軍需省官制). It was created by merging the greater part of the Ministry of Commerce and Industry (商工省, Shōkō-shō) with the national mobilization division of the Cabinet Planning Board (企画院, Kikaku-in), as part of Prime Minister Tōjō Hideki's drive to centralize wartime production under a single authority.

ORIGINS: FROM COMMERCE TO MUNITIONS

The Ministry of Commerce and Industry had been established on April 1, 1925 (Taishō 14), when the Ministry of Agriculture and Commerce (農商務省) was split into the Ministry of Agriculture and Forestry (農林省) and the Ministry of Commerce and Industry. Throughout the 1930s and into the Pacific War, the Commerce Ministry oversaw Japan's industrial policy, but as the war intensified, the fragmentation of production control among multiple agencies — the Commerce Ministry, the Planning Board, and the military procurement bureaus of the Army and Navy ministries — was identified as a critical bottleneck in Japan's war production.

ESTABLISHMENT AND TŌJŌ'S CONCENTRATION OF POWER

On November 1, 1943, Tōjō reorganized the government by establishing the Ministry of Munitions, absorbing the Commerce Ministry's industrial bureaus and the Planning Board's mobilization functions. Tōjō himself assumed the post of Minister of Munitions (軍需大臣) while simultaneously serving as Prime Minister, War Minister (陸軍大臣), and (from February 21, 1944) Chief of the Army General Staff (参謀総長). This unprecedented concentration of civil and military authority in a single individual was modeled partly on Germany's Ministry of Armaments under Albert Speer, which had achieved dramatic increases in war production through centralized control.

The Ministry of Munitions was charged with:

1. Unified control of all military-industrial production: aircraft, ordnance, ammunition, naval vessels, vehicles, and communications equipment

2. Allocation of strategic raw materials: steel, aluminum, copper, rubber, petroleum products

3. Direction of the war economy through production quotas and priority designations for critical munitions

4. Supervision of the "Munitions Companies" (軍需会社) system, whereby designated private corporations were placed under direct government control with their presidents appointed as "production responsibility officers" (生産責任者)

5. Labor mobilization for war industry, including the direction of conscripted workers to priority factories

The Munitions Companies Act (軍需会社法, Gunju Kaisha Hō), promulgated in October 1943, designated approximately 150 major corporations (later expanded to over 600) as Munitions Companies. These firms — including Mitsubishi Heavy Industries, Nakajima Aircraft, Kawasaki Aircraft, and the major zaibatsu subsidiaries — were subjected to government direction of production targets, resource allocation, and even executive appointments, while receiving guaranteed profits and priority access to materials and labor.

WARTIME PRODUCTION CRISIS

Despite the organizational consolidation, the Ministry of Munitions faced insurmountable challenges. Japan's aircraft production peaked at approximately 28,180 units in 1944 but the quality of output declined sharply as experienced workers were drafted into military service and replaced by student and female conscript labor. American submarine warfare severed the supply of raw materials from Southeast Asia: petroleum imports collapsed from 1.5 million kiloliters (1943) to virtually zero by mid-1945. The strategic bombing campaign by B-29s from late 1944 systematically destroyed Japan's industrial infrastructure — the Musashino Nakajima engine plant, Mitsubishi's Nagoya works, and hundreds of other facilities were repeatedly struck.

The ministry's wartime headquarters was located in the Kasumigaseki government district. Military officers from both the Army and Navy occupied key positions within the ministry, reflecting its role as a bridge between civilian industry and military demand. The relationship between the Munitions Ministry and the zaibatsu-dominated industrial combines was complex: Tōjō sought to impose state control over the zaibatsu's production, but the industrial combines retained significant autonomy and the ministry never achieved the degree of centralized direction that Speer exercised in Germany.

DISSOLUTION AND REVERSION TO COMMERCE MINISTRY

Following the fall of the Tōjō cabinet on July 18, 1944 (after the loss of Saipan), subsequent ministers of munitions continued the ministry's work under the Koiso and Suzuki cabinets. After Japan's surrender on August 15, 1945, Vice-Minister Shiina Etsusaburō (椎名悦三郎) — who would later become a major postwar conservative politician — led the rapid reversion of the Munitions Ministry back to the Ministry of Commerce and Industry on August 26, 1945 (Shōwa 20). This preemptive self-dissolution was a calculated bureaucratic maneuver to forestall a more drastic dismantling by the Allied occupation authorities (GHQ/SCAP).

The restored Commerce Ministry was subsequently reorganized into the Ministry of International Trade and Industry (通商産業省, MITI) on May 25, 1949 — the powerful agency that would guide Japan's postwar economic miracle. MITI was further reorganized into the Ministry of Economy, Trade and Industry (経済産業省, METI) on January 6, 2001.

THE SITE TODAY

The current METI headquarters complex (経済産業省総合庁舎) at Kasumigaseki 1-3-1, Chiyoda Ward, stands on the site historically associated with the Commerce Ministry and its wartime successor. The main building (本館) was completed in 1984, and the annex (別館) dates from 1973. No monument or marker at the site specifically commemorates the wartime Ministry of Munitions. The METI building is accessible by the public during business hours for official purposes; the exterior is freely viewable from the surrounding streets and Kasumigaseki Station exits.