A transmission for vehicles is provided with a plurality of drive gears, an input shaft connected to the drive shaft of an engine, an output shaft disposed parallel to the input shaft, a driven gear which meshes with each drive gear and is rotatably disposed on the output shaft, a synchromesh mechanism which has a sleeve movable in the axial direction of the output shaft, is engageable with a side portion of the driven gear, and couples the driven gear to the output shaft, and a parking gear formed integrally with the sleeve of the synchromesh mechanism. The parking gear and the bearing on the shaft end radially overlap each other. With this structure, the transmission is composed with a small number of components and has a reduced width.