The invention provides a synchromesh device which can further suppress collision sound than ever. The synchromesh device (10) has a variable gear (14), a synchronous hub (16), a synchronous sleeve (18), a synchronous cone (15) and a locking ring (24). A recess (37) and a projection (42) are arranged on the synchronous hub (16) and the locking ring (24). The recess (37) and the projection (42) are configured to be clamped in a relative rotation regulated range manner. A leaf spring part (50) is arranged between the recess (37) and the projection (42) and extends from the recess (37) to the projection (37). The end of the leaf spring part (50) is formed by a free end capable of free oscillating.