Masatomi Ikeda was born in Tokyo, Japan. He was already interested in budo and sports in general when he was young which resulted in achieving a 5th dan in sumo and 4th dan in judo. He started to train in Aikido in 1958. In 1960 he enlisted into the dojo of Hiroshi Tada (9th dan Aikikai). He started intensively practising budō, especially aikido. He trained himself in judo at the Kodokan Institute and at the dojo of Dokkyo High School. For sumo he trained in the stable of Kise’s .

In 1964, he graduated at the Nippon Physical Education University. In October 1965, he went on his first journey to Italy with the aim of promoting Aikido which he had been teaching for approximately five years. He also obtained a university degree in gymnastics and health sciences; he would have had the possibility of teaching these subjects, but he choose the way of the budōka and spent his time as an aikido teacher, primarily in Naples.

In 1971, he returned to Japan with the aim of relearning aikido from the basics. Besides aikido, he worked as gymnastics professor at the Dokkyo High School, where he had been a pupil before. Seven years passed instead of one or two years as he had envisaged. He collected some experience in teaching and some knowledge in Asian medicine like Seitai and seibukenkoho (method of cure according to the manner of seibu). He had also the possibility to learn the hojo kata  (in the Kobudo Chokoshinei-ryu).

In 1977, he travelled to Europe at the request of the Swiss Cultural Association for Aikido (ACSA). He arrived in Switzerland in October of that year. When he resided in Italy, he was also teaching judo, but from his arrival in Switzerland on, he completely dedicated his life to aikido. He was a delegated teacher by the Aikikai  Foundation in Tokyo and his occupation was promoting Aikido. He served the ACSA for more than 25 years.

In 1986, the Aikido Ikeda-Dojo Zurich opened. During the following years, as a technical director of the ACSA, he visited continiously the various ACSA dojos all over Switzerland at a rate of two or three dojos per week! This was in addition to the weekly half-dozen trainings which he taught in his dojo in Zurich. In parallel, he led national and international training seminars to maintain the friendship with and to practice with aikidoka in nearby countries. Examples are the yearly ACSA winter course in Zurich, Switzerland, which he led on many occasions together with Katsuaki Asai  of the German Aikikai and Hideki Hosokawa of the Italian Aikikai, the yearly summer course in Saignelégier, Switzerland, with his teacher Hiroshi Tada shihan of the Italian Aikikai and the yearly late summer or early autumn courseinPraiano, Italy, with Pasquale Aiello all of which were his good friends. In 1989, he received the 7th dan in Aikikai aikido. Thereafter, he was also occupied with the Aikikai in the Czech Republic since 1995, with the Slovak Aikido Association since 1996 and the Yugoslav Aikido Federation in Serbia since 1997. In 1998 he became the technical director for the Turkish Aikido Association, and in 1996 he became technical adviser of the International Aikido Federation  together with Hiroshi Isoyama (9th dan Aikikai). In parallel, he regularly taught seminars in countries like Croatia, Hungary, Russia and Poland