This paper aims to shed light on several previously unknown aspects of Japan-Thailand relations during the period from November 11, 1935, when Mitsubishi Corporation (三菱商事) opened a branch in Bangkok, to 1943. It does so by utilizing documents related to Thailand—mostly drafts of reports, referred to in this paper as the “Nitta Documents”—and a diary, referred to as the “Nitta Diary,” which were in the possession of Yoshimi Nitta (March 24, 1894–November 6, 1992), who held the top position at Mitsubishi Corporation in Bangkok from 11 November 1935, when it opened its Bangkok branch, until 1943, excluding a two-year interruption.
Major Japanese diplomatic documents and official records of the Japanese military related to Japan-Thailand relations during this period were destroyed at the end of World War II in 1945. However, the Nitta Documents and Nitta Diary contains invaluable records of Japan-Thailand relations that cannot be found elsewhere. One such example is an entry from July 30, 1939, which records a conversation Nitta had with Jirō Saitō, the Japanese Army Attaché in Thailand:
“Saitō came to visit, and we had a meal at the Bangkok Hotel. There was talk of taking Luang Sinsongkhramchai [Sindhu Songgramjai,the head of the Thai Navy] to Japan for discussions on a military agreement.”
Yoshimi Nitta graduated from the University of Tokyo’s Department of Mechanical Engineering in 1920 and joined Mitsubishi Corporation. From 1924 until his assignment to Bangkok in 1935, he spent over a decade—continuously from the age of 30 to 41—working in the United States and Europe.
Nitta was a distinguished figure in the Japanese community in Bangkok. He was elected as the chairman of the Siamese Japanese Association Board of Directors for one term, from April 18, 1937, to April 5, 1938, during which the association’s president was Shinzo Mihara. He also served as the president of the Siam Japanese Chamber of Commerce, succeeding Namba Katsuji of Yokohama Specie Bank upon his return to Japan on December 5, 1938. He was re-elected for another term at the general meeting on April 3, 1939, but later transferred his position to Fukuda Junkichi of Yokohama Specie Bank on August 12, 1939, before returning to Japan.
In the mid-1930s, Thailand experienced an economic recovery, leading to increased capacity for new investments. At the same time, the People’s Party government entered a period of relative stability, initiating state-led development projects that intertwined politics and economics. During this period, Japan expanded its presence in Thailand by dispatching army and navy attachés and strengthening its legation functions. Major Japanese private enterprises also began full-scale expansion into the Thai market. Mitsubishi Corporation was among the companies that entered Thailand at this time, with one of its objectives being to promote its business to the new projects initiated by the People’s Party government.
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