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＜Instructors＞

Hideki Kamezawa, 6th Dan
Dojo Head Naoyuki Sonobe, 5th Dan

Wednesdays & Fridays Class
1st & 5th Sundays Class Mondays Class
4th Sundays Class

Hideki Kamezawa joined Showa Dojo in 1998 and has served as Dojo Head since April 2025. Aikido has no competitions and is not a martial art in which practitioners are ranked by winning or losing, so beginners can take part in practice with confidence. We provide an environment where students can continue training at their own pace while improving both mind and body.

Naoyuki Sonobe began Aikido at university and continued training for several years at another dojo after graduation. He joined Showa Dojo in 2014 and has continued training here ever since. He has also practiced Judo since junior high school, and his Aikido is dynamic and powerful. He actively participates in training and seminars outside Showa Dojo and is always dedicated to studying techniques. His motto is “Ichigo Ichie” — treasure every encounter as a once-in-a-lifetime meeting.

＜Assistant Instructors＞

Masahiro Nishio, 4th Dan Kazuo Tanaka, 4th Dan

2nd Sundays Class 　

Masahiro Nishio joined Showa Dojo when he was nine years old, and Aikido has been part of his growth ever since. He earned his shodan when he was in his second year of high school, and during his time studying abroad, he also had the opportunity to teach at a university club. Through Aikido, he experienced many moments of connection beyond differences in language and culture, which deepened his appreciation of its unique appeal. He currently teaches the second Sunday class. Those who are interested in trying Aikido are welcome to visit the dojo and experience its atmosphere for themselves.

Kazuo Tanaka joined Showa Dojo in 1998 and began training from the basics in his late forties. He is extremely dedicated to studying Aikido, and after several years of further training at other dojos, he was promoted to 4th Dan. He is well regarded for his kind, careful, and attentive instruction of junior members.

Shunsuke Mizutani, 4th Dan

Mondays & Wednesdays,
Children’s Class

Shunsuke Mizutani works as a data engineer at Brother Industries. He began Aikido at Nanzan University and joined Showa Dojo after graduation. He is currently in charge of the children’s class, and as of 2026, he has ten years of experience teaching children. He pays close attention to safety to prevent injuries and carefully observes each child, helping them learn Aikido in a bright, enjoyable, and energetic atmosphere.

■Notice Regarding Instructors and Management Structure■
Please refer to the information provided on this website for the official instructors and management structure of Showa Dojo.
Showa Dojo does not verify or endorse any career history or affiliation claims made by external organizations or individuals that are not listed on this website.

AIKIDO SHOWA DOJO

(Officially Certified by Aikikai Foundation)

＜Instructors＞

＜Assistant Instructors＞

Hideki Kamezawa, 6th Dan Dojo Head	Naoyuki Sonobe, 5th Dan
Wednesdays & Fridays Class 1st & 5th Sundays Class	Mondays Class 4th Sundays Class

Hideki Kamezawa joined Showa Dojo in 1998 and has served as Dojo Head since April 2025. Aikido has no competitions and is not a martial art in which practitioners are ranked by winning or losing, so beginners can take part in practice with confidence. We provide an environment where students can continue training at their own pace while improving both mind and body.	Naoyuki Sonobe began Aikido at university and continued training for several years at another dojo after graduation. He joined Showa Dojo in 2014 and has continued training here ever since. He has also practiced Judo since junior high school, and his Aikido is dynamic and powerful. He actively participates in training and seminars outside Showa Dojo and is always dedicated to studying techniques. His motto is “Ichigo Ichie” — treasure every encounter as a once-in-a-lifetime meeting.

Masahiro Nishio, 4th Dan	Kazuo Tanaka, 4th Dan
2nd Sundays Class

Masahiro Nishio joined Showa Dojo when he was nine years old, and Aikido has been part of his growth ever since. He earned his shodan when he was in his second year of high school, and during his time studying abroad, he also had the opportunity to teach at a university club. Through Aikido, he experienced many moments of connection beyond differences in language and culture, which deepened his appreciation of its unique appeal. He currently teaches the second Sunday class. Those who are interested in trying Aikido are welcome to visit the dojo and experience its atmosphere for themselves.	Kazuo Tanaka joined Showa Dojo in 1998 and began training from the basics in his late forties. He is extremely dedicated to studying Aikido, and after several years of further training at other dojos, he was promoted to 4th Dan. He is well regarded for his kind, careful, and attentive instruction of junior members.
Shunsuke Mizutani, 4th Dan
Mondays & Wednesdays, Children’s Class

Shunsuke Mizutani works as a data engineer at Brother Industries. He began Aikido at Nanzan University and joined Showa Dojo after graduation. He is currently in charge of the children’s class, and as of 2026, he has ten years of experience teaching children. He pays close attention to safety to prevent injuries and carefully observes each child, helping them learn Aikido in a bright, enjoyable, and energetic atmosphere.