日俄战争开始后,松冈被派到中国东北。其后他三度进入满铁,担任过理事、副总裁、总裁。任职期间,满铁修建了多条铁路。在松冈一手操持下,实现了首任总裁后藤新平立案的满铁大调查部,满铁诸多调查报告对日本当局的决策起着重要作用。 After the Russo-Japanese War began, Matsuoka was sent to northeast China. He then entered Manchuria three times, served as director, vice president, president. During his tenure, Manchuria built a number of railways. Under the control of Matsuoka, Manchuria Investigations Department, the first president Goto Shinpei, was established. Many reports of Manchuria’s investigation play an important role in the decision-making of the Japanese authorities.