National Diet Building

The National Diet Building (国会議事堂, Kokkai-gijidō) stands at 1-7-1 Nagatacho, Chiyoda Ward, Tokyo, serving as Japan's parliament since its completion on November 7, 1936. The imposing granite structure, with its distinctive 65.45-meter central pyramid tower, was constructed almost entirely from Japanese materials over a 17-year period beginning in 1920, symbolizing national pride and modern governance.

During the Second World War, the Diet Building was the epicenter of Japan's wartime political apparatus. Although the Meiji Constitution vested sovereignty in the Emperor and real power increasingly shifted to the military, the Imperial Diet (帝国議会) remained the formal legislative body through which wartime laws were enacted and budgets approved.

Key wartime legislation passed within these chambers included the National Mobilization Law (国家総動員法, passed March 24, 1938), which granted the government sweeping powers over civilian organizations, industry, labor, media, and the economy without requiring further legislative approval. The law's fifty clauses effectively transformed Japan into a total war state. The Special Account Act for Extraordinary Military Budget (臨時軍事費特別会計法, September 1937) established the fiscal framework for war spending, enabling the government to finance military operations through massive debt issuance.

On December 8, 1941 (Japan time), the Imperial Diet convened to formally approve the Imperial Rescript declaring war on the United States and the British Empire. Prime Minister Hideki Tojo read Emperor Hirohito's declaration to thunderous applause from the assembled members. The 77th Extraordinary Session had concluded just weeks earlier on November 21, 1941, having laid the political groundwork for war.

In 1940, all political parties had been dissolved and absorbed into the Imperial Rule Assistance Association (大政翼賛会, Taisei Yokusankai), headed by Prime Minister Fumimaro Konoe. The Yokusan Election of April 30, 1942 — the only general election held during the Pacific War — was conducted under intense government pressure. Prime Minister Tojo spent approximately ¥2.3 million bribing politicians and newspaper editors, and the Doolittle Raid just 12 days before the election inflamed pro-government sentiment. Of the 466 seats, 381 were won by Yokusankai-endorsed candidates, and when the Diet assembled in May 1942, 98% of members joined the Imperial Rule Assistance Political Association (翼賛政治会). The Diet effectively became a rubber-stamp body for the military government.

Throughout the war, the Diet Building hosted sessions that approved ever-expanding military budgets, ratified wartime regulations, and provided a veneer of constitutional legitimacy to authoritarian rule. Notable dissenting voices were rare but included figures like Yukio Ozaki, the "God of Constitutionalism," who was arrested in 1942 for lèse-majesté after questioning the war effort.

Remarkably, the National Diet Building survived the devastating Tokyo firebombing campaign of 1945 completely intact. While the surrounding Kasumigaseki district, Shinagawa, and Nihonbashi were reduced to ash, the Diet compound and the nearby Imperial Palace were deliberately left untouched by Allied bombers. After Japan's surrender on August 15, 1945, the building continued to serve as the seat of the legislature under Allied occupation, where it passed the new postwar Constitution of Japan (promulgated November 3, 1946) that transformed the Diet from an advisory body under imperial sovereignty to "the highest organ of state power" under popular sovereignty.

The building remains in active use today as the seat of both the House of Representatives (left wing) and the House of Councillors (right wing), and is open for public tours. It stands as an enduring physical witness to Japan's wartime political transformation and postwar democratic rebirth.