Construction of rotary machinery with a one-way clutch integrated pulley is achieved that is capable of reducing the manufacturing cost when the location in the axial direction of the one-way clutch integrated pulley 9a with respect to the rotary machinery 1a changes. In construction where a sleeve 10a of a one-way clutch integrated pulley 9a is supported by and fastened to a rotating shaft 4 in a housing 2, by placing a circular ring shaped spacer 35 between one end surface of the sleeve 10a and the other end surface of a support bearing 3 for the rotating shaft 4, it is possible to position the one-way clutch integrated pulley 9a in the axial direction with respect to the rotary machinery 1a without changing the length of the sleeve 10a for each type of vehicle.