The second son of a doctor,Hasegawa was born in the village of Yashiro in the district of Asuwa,Fukui Prefecture,now incorporated into the city of Fukui. Having aspirations to join the Navy from an early age,in 1900 he graduated from high school and enrolled at the Imperial Japanese Naval Academy on 17 December. He graduated as a midshipman on 14 December 1903,ranking sixth in his class of 173,and joined the crew of the cruiserMatsushima. He transferred to the battleshipYashima on 4 January 1904. As Hasegawa had graduated on the eve of the Russo-Japanese War,his class did not make the usual long-distance navigational training voyages,which only resumed after the conflict. On 23 May,Hasegawa was transferred to the battleship Mikasa. He received minor wounds at the Battle of the Yellow Sea on 10 August,and was commissioned an ensign on 10 September. Serving at the decisive Battle of Tsushima on 27 May 1905,Hasegawa was promoted to sub-lieutenant on 5 August. He was wounded when the Mikasa exploded and sank at Sasebo on 11 September. He was then assigned to the cruiser Itsukushima and embarked on a training cruise from 15 February 1906,returning to Sasebo on 25 August. He rejoined the Mikasa five days later after her reconstruction had been completed. Hasegawa was assigned to the destroyerShirotae on 23 February 1907,and was promoted to lieutenant on 25 September 1908.
Hasegawa enrolled at the Naval War College as a Class B student on 25 May 1909,and entered the naval torpedo school on 24 November. Graduating on 23 May 1910,on 25 May he was assigned to the armoured cruiserAsama as a squad leader,and assigned to the Kasagi on 24 June. On 16 October,he embarked on a cruise which took him to Honolulu,San Francisco and Acapulco,returning to Japan on 6 March 1911. Appointed to the staff of the Second Fleet on 11 March,he was appointed an instructor at the Naval War College torpedo school on 1 December. He enrolled at the Naval War College as a Class A student on 1 December 1912,and was promoted to lieutenant-commander on 1 December 1913. He graduated on 27 May 1914,ranking second in his class of 16,and briefly commanded the destroyer Mikazuki before being assigned as the aide to the admiral of the Second Fleet.
During World War I,Hasegawa participated in the Siege of Tsingtao in October 1914. In February 1915,he was assigned to the Personnel Department of the Navy Ministry and on 1 April 1916 was appointed assistant secretary to the Minister of the Navy and future Prime Minister Admiral KatōTomosaburō. On 1 December 1917,he was assigned as an assistant naval attaché at the Japanese embassy in Washington,D.C.,and was promoted to commander a year later. As anti-Japanese and general sentiments against the "yellow peril" remained high,fears of spying prompted embassy officials to ban the use of the Japanese language within the embassy and to only speak in English;however,Hasegawa personally felt the Americans genuinely had decent motives. He became good friends with Yamamoto Isoroku,his successor as naval attaché. Hasegawa was promoted to naval attachéin Washington on 20 March 1919,and returned to Japan the following year,resuming service in the Personnel Department of the Navy Ministry.
On 1 December 1922,Hasegawa was promoted to captain and appointed director of the Personnel Department. He was appointed to the Imperial Japanese Navy General Staff the following 1 November. Though Hasegawa had differences with his superior Admiral Katō,they maintained harmonious relations. Hasegawa was also in favour of allowing all qualified candidates admittance to the Naval Academy and Naval War College,regardless of political affiliation. This cemented his friendship with a fellow captain and future vice-admiral,Terashima Ken (1882 - 1972);they remained friends until Hasegawa's death. Hasegawa was again appointed naval attachéin Washington on 10 November,returning to Japan on 15 April 1926. He was given the command of the coastal defence vessel and former cruiser Nisshin on 1 May,and received the command of the Nagato on 1 December.
Hasegawa was promoted to rear admiral on 1 December 1927 and appointed commander of the Yokosuka Naval District. He was appointed commander of the Third Torpedo Squadron on 1 September 1929 and appointed commander of the Submarine Squadron on 30 November. The following year,he was appointed head of naval policy in the Navy Ministry,and appointed commander of the Kure Naval Arsenal on 1 December 1931. Re-appointed to the Naval General Staff in October 1932,Hasegawa attended the World Disarmament Conference in Geneva from April to October 1933. He was promoted to vice-admiral on 1 December 1933 and became Vice-Minister of the Navy in May 1934.
In December 1936,Hasegawa was given command of a fleet,and was appointed commander of the Third Fleet on 20 October 1937. The Panay Incident took place during his tenure as fleet commander. As Commander-in-Chief of the Third Fleet in China,Hasegawa met several Chinese admirals and generals,who respected Hasegawa for his civil behaviour. He was once again assigned to command the Yokosuka Naval District on 25 April 1938,and was promoted to full admiral on 1 December 1939.
Hasegawa was appointed a military councillor on 1 May 1940,and appointed the 18th Governor-General of Taiwan on 27 November;though it was customary for Governors-General to be retired military officers,the Naval Minister,KoshirōOikawa,insisted on Hasegawa's remaining on active service. Hasegawa arrived in Taihoku (Taipei) on 16 December. An anecdote is given that at the new Governor-General's official welcoming ceremony;he picked up a maid in a burst of exuberance and sat her on his lap,which astonished many of those present. During Hasegawa's tenure as Governor-General,a preparatory course for Taihoku Imperial University was set up and compulsory education at the elementary level strengthened. He moderated the radical Kominka (Japanization) movement in Taiwan promoted by his predecessor,SeizōKobayashi,who wanted to replace Taiwanese folk religion by Japanese Shinto.[1] He relinquished his office on 30 December 1944 and returned to Japan.
Later naval career
Hasegawa had been considered as a candidate for Naval Minister in the new cabinet of Suzuki Kantarō;instead,he was appointed inspector-general of the Imperial Navy and headed an office conducting research into advanced naval technologies from 1 June 1945. The office continued to function until the surrender of Japan on 15 August. Along with all other Imperial officers,he entered the reserves on 30 November,after over four decades of service.
Postwar
Along with many other leading politicians and military commanders,Hasegawa was arrested in late 1946 as a suspected Class A war criminal by the American occupation authorities. As he had been commander of naval forces in China at the time of the Panay Incident,he was questioned by GHQ officers. However,Hasegawa made a formal apology to the American and British officers;impressing the court with his integrity,he was acquitted. Following his release from Sugamo Prison on 14 January 1947,in 1951 he sat on an advisory committee composed of former Imperial Japanese Navy officers to oversee the formation of the Japan Maritime Self-Defence Force.
Hasegawa died in Kamakura on the 25th anniversary of the end of the Second World War,aged 87. His grave is at the Kamakure Reien Cemetery.
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