Hamamatsu Air Raids & Naval Bombardment Site

Hamamatsu, a major industrial city on the Tōkaidō Main Line railway connecting Tokyo and Osaka in Shizuoka Prefecture, was attacked unusually often for a city of its size during World War II, enduring 27 air raids and naval bombardments. With a wartime population of approximately 166,000, the city was home to critical military assets including the Hamamatsu Army Air School, Nakajima Aircraft Company factories, Mitsubishi Motors facilities, Suzuki Motors plants, and the Japan Musical Instrument Company (Nippon Gakki, now Yamaha), many of which had been converted to wartime production.

The bombing campaign began in late 1944 and escalated dramatically in 1945. On February 15, 1945, B-29 Superfortress bombers from a 54-aircraft force sent against the Mitsubishi aircraft-engine works in Nagoya also bombed southern Hamamatsu, killing about 150 people. On April 30, 69 B-29s conducted a firebombing raid on central Hamamatsu that killed approximately 1,000 civilians. A further raid in May — dated May 19 in Japanese records, while some English-language accounts describe a May 14 attack by 135 B-29s of the 314th Bombardment Wing — killed about 450 more. The most devastating single raid came on June 18, 1945, when an armada of B-29s unleashed a massive incendiary attack that created a firestorm engulfing the city center, killing some 1,700–1,800 people in a single night (1,717 according to the Japanese government's war-damage record).

On July 29, 1945, a powerful Allied naval task force under Rear Admiral John F. Shafroth Jr. conducted a shore bombardment of Hamamatsu. The fleet included three American battleships — USS South Dakota, USS Indiana, and USS Massachusetts — the British battleship HMS King George V, heavy cruisers USS Quincy and USS Chicago, and numerous destroyers. HMS King George V alone fired 265 fourteen-inch rounds in 27 minutes. The bombardment targeted rail infrastructure and factories, killing 170 people. This engagement was historically significant as the last time a British battleship fired its guns in anger.

By war's end, the United States Strategic Bombing Survey reported that 60.3% of Hamamatsu had been totally destroyed, with more than 3,000 people killed (totals of around 3,500 are also cited), more than 9,400 buildings collapsed, over 20,000 burned, and approximately 120,000 residents — 64% of the population — left homeless. The Hamamatsu Reconstruction Memorial Museum (浜松復興記念館), opened in 1988 in central Hamamatsu (利町), preserves photographs, artifacts, and testimonies from the air raids, serving as the city's primary memorial to the wartime devastation.

A cenotaph for the bombing victims stands in Hamamatsu Castle Park, erected on March 21, 1979, as a permanent memorial to all those who perished in the raids.