At the beginning of his installation, Ueshiba taught in private homes of several of his patrons. His students were military officers, politicians and business leaders. Among them, was Admiral Takeshita, a very passionate student: He had chaired the Sumo Association, and supported Ueshiba. He had studied Daito- ryu for over ten years and had lectured in his home. Admiral Takeshita took great pains to make Ueshiba and his art known in various media . This support was certainly decisive in the success that Ueshiba experienced in Tokyo.

In 1930, a fundraise allowed the opening of a dojo in Ushigome , Shinjuku , that he’ll name the ‘Kobukan’ . Currently it was still here that the headquarters of the Aikikai took place .In October 1930, it was visited by Jigoro Kano Sensei, master Kokodan , founder of the Judo . Master Kano was so impressed by the techniques of Ueshiba that he sent many of his best students to learn Aikido. The Kobukan dojo was then known as the "Hell Dojo".

Among the students in this time were renown practitioners such as Yoichiro Inoue , Kenji Tomiki , Minoru Mochizuki , Tsutomo Yokawa , Shigemi Yonekawa , Gozo Shioda and Rinjiro Shirata .

Between 1939 and 1940, in addition to his teaching at Kobukan , Morihei was hired to teach martial arts in various military academies such as the school for officers in Toyama, the Nakano spies school , the naval school, etc. . But in reality the teaching was often delegated to advanced students from Kobukan as the employment time of Ueshiba was overloaded.

During part of this time, Ueshiba was employed to teach the techniques of Daito- ryu Aiki - jujutsu - and delivered the written diplomas on rollers. However, his relationship with Takeda Sensei had deteriorated and he gradually had distanced himself from his former teacher . Morihei seemed to have had no contact with Sokaku Takeda after the mid- thirties.

In 1931 the "Association for the promotion of martial arts"was created under the auspices of the Omoto religion at the instigation of Onisaburo This association was created in order to promote the work of Morihei in martial arts. Antennas of this school were established throughout Japan and organized training in martial arts in parallel with local meetings of the Omoto religion. This type of organization will be effective from 1931 until the end of 1935, when the Omoto - kyo religion will suddenly be banned by the Japanese military government.

In 1939, Morihei was invited to Manchuria to make a public demonstration. There he fought former sumo wrestler Tenryu and nailed him to the ground with one finger. From then Tenryu became his pupil. He then made several visits to Manchuria , the last in 1942 on the occasion of the tenth anniversary of the creation of the state of Manchuria. That day, he made his demonstration in the presence of Emperor Pu'Yi.

April 30, 1940, the Kobukan obtained the status of " Recognized Training by the ministry of health and hygiene ." The first president was Admiral Isamu Takeshita.