A power transfer/transmission apparatus includes clutch adjusting mechanisms that are easy to assemble and are stably supported, the power transfer/transmission apparatus has a clutch housing, the clutch housing includes a vertical wall (a flange and a vertical wall) connected to a joint shaft and a peripheral wall connected to the vertical wall and enclosing a main clutch, the flange has an output unit support that rotatably supports a first end of a clutch output unit at a position that is axially different from the position of the joint shaft, a second end of the clutch output unit includes a centering part that forms a hollow axle joint having inner splines engaged with an axle so that the axle joint and axle may rotate together.