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Samurai actors perform sword fights during an event recreating Edo-period Japan.
A police representative told $4 the actor was pierced in the abdomen "with a sword-like object" during an action scene in a rehearsal session for a "jidaigeki" drama (a genre based on the Edo period of Japanese history) at a studio in Koto, Tokyo.
The other actors $4 heard Kashino groan and turned to discover him hunched over - but no one saw what happened.
Police are now investigating whether his death was an accident or a criminal act.
Jidaigeki dramas portray the daily lives of samurai, farmers, and ninjas during Japan's $4 between 1603 and 1868.