The invention provides an effective technology capable of realizing seamless shift smoothly in a vehicle transmission comprising a mechanism for carrying out seamless shift between a speed gear at a low speed side and a speed gear at a high speed side. The vehicle transmission comprises a first connecting component and a second connecting component, a first movable component capable of moving at a connecting position and a non-connecting position, a second movable component capable of moving at the connecting position and the non-connecting position, a clutch mechanism capable of setting a transmission state of a rotary torque of an output shaft in relative to the first connecting component and the second connecting component, and a drive device for driving the first movable component and the second movable component to the connecting position of the non-connecting position, wherein the clutch mechanism comprises a first clutch friction plate, a second clutch friction plate, a first connecting sheet and a second connecting sheet. The vehicle transmission can selectively realize any mode of a low speed mode, a high speed mode and a middle speed mode.