The purpose of this research is to clarify the structure and specifications of theOtaru Branch of the Bank of Japan which was built in 1912.The structure of this building.the sixth branch of the Bank of Japan built in the Meiji era.is made of masonry.! compared this building with the other Bank of Japan buildings regarding specifications of the foundations,walls,floors,roof trusses and roofs. The research made it clear that this building made use not only of established techniques but of the most advanced techiniques of that time.