VEHICLE TRANSMISSION STRUCTURE

A vehicle transmission structure of an embodiment includes a shift drum which rotates in accordance with a shift operation; a bearing member which rotatably supports the shift drum with respect to a transmission case; a set member which positions the bearing member; a shift fork shaft supported by the transmission case; and a shift fork supported by the shift fork shaft to be movable in an axial direction. An end portion of the shift fork shaft is movably fitted to an insertion hole provided in the transmission case, a cap is provided at an end portion of the shift fork shaft, a first gap is provided between an end surface of the insertion hole and the cap, the set member is disposed at a position overlapping the insertion hole when viewed in the axial direction, and a second gap is provided between an end surface of the insertion hole and the set member.