Former Mitsui’s engagement with Thailand traces back to 1906 when the company establised its overseas office in Bangkok as a pioneer of Japanese company. At the turn of the century, Thailand was known as Siam, a kingdom with a rich cultural heritage and abundant natural resources. Former Mitsui recognized the immense potential of this nation and embarked on a journey that would span generations.

In its early years in Thailand, Former Mitsui primarily focused on the teak trade. It’s operations played a pivotal role in exporting teak from Thailand to markets worldwide. However, their endeavors were not limited to timber. Recognizing the need for diversification, the company sought to open new markets for various products, including rice, silk, cloth, cotton, and coal. These efforts laid the foundation for a diversified and resilient presence for Former Mitsui in Thailand.

In 1935, the Bangkok representative office was promoted to Bangkok Branch of Former Mitsui. Along with the expansion of the trading businesses, the number of employees of the branch had grown to over 100. But with the end of World War II led to the confiscation of all assets of the Bangkok Branch of Former Mitsui.