To reduce the number of components in a vehicle transmission that includes a mechanism for making a seamless shift between a low-speed-side gear shift stage and a high-speed-side gear shift stage.

A vehicle transmission includes an engaged member 130 provided between a first idling gear G1o and a second idling gear G2o so as to be incapable of relative rotation and axial movement, a first engaging member 110 provided between the first idling gear G1o and the engaged member 130 so as to be movable between an engagement position of engaging with the engaged member 130 and a disengagement position of disengaging the engagement, a second engaging member 120 provided between the second idling gear G2o and the engaged member 130 so as to be movable between an engagement position of engaging with the engaged member 130 and a disengagement position of disengaging the engagement, and a driving device for axially driving each of the first engaging member 110 and the second engaging member 120. Owing to this configuration, it is possible to selectively establish any mode of a low-speed mode, a high-speed mode, and an intermediate mode.