Speaking of the oldest martial arts in Japan, Kendo is the answer,

Speaking of the oldest martial arts in Japan, Kendo is the answer, where Kendo comes from the Budo tradition. Maybe you've seen what Kendo martial arts look like, which is with great sword techniques. But apart from sword techniques, in sports Kendo also teaches the philosophy that Budo inherits. Like other martial arts sports, Kendo is a type of martial arts that is also most often contested. National to international Kendo matches have been held and this is a match where one person against one person is a match between women or men.

The word "do" in Budo means a way or way that can be used to become a self-developer through martial arts training. Not only physical training, but in Kendo, each exercise will strengthen the soul, the conviction and positive outlook of each practitioner. The following are a number of Kendo techniques that are trained and need to be mastered.