Okada Shinichirō (岡田信一郎) (20 November 1883 – 4 April 1932) was a prominent Japanese architect who practiced in the early twentieth century. Okada taught at Waseda University and Tokyo School of Fine Arts. While he was well-known for tendency for European styles, he also produced work in the Imperial Crown style (帝冠様式, Teikanyōshiki). One example is the Biwako Otsukan in Yanagasaki Lakeside Park, Shiga Prefecture.
Source: “Okada Shinichirō”, English Wikipedia (CC BY-SA 4.0), excerpt