Yoseikan (養正館, Yōseikan) was the name given to Minoru Mochizuki's dojo built in November 1931 in Shizuoka, Japan.
The brother and friends of Master Minoru Mochizuki built this dojo for him while he was recovering from pleurisy and pulmonary tuberculosis.
It reflected his teacher's ideals and it reinforced the positive attitude of "Mutual welfare and prosperity" he had always promoted.
The official opening of the dojo was held in November 1931 and many dignitaries from Tokyo, including Morihei Ueshiba, Admiral Isamu Takeshita, and General Makoto Miura attended.
The martial arts taught at the dojo included Aikido, Judo, Karate, and Tenshin Shoden Katori Shinto Ryu.