To provide means for dispensing with a run-in of a planetary roller screw device.

The planetary roller screw device 1 includes a central screw shaft 2 having a shaft thread 3 formed on an outer peripheral surface, a cylindrical nut 4 having a nut thread 5 formed on an inner peripheral surface, and a plurality of planetary rollers 6 each having a roller thread 7 in mesh with the shaft thread 3 and nut thread 5 on an outer peripheral surface and adapted to revolve with rotation between the central screw shaft 2 and the nut 4. The surface roughness of the thread faces of at least either of two threads in cross mesh out of the shaft thread 3, nut thread 5 and roller thread 7 is controlled beforehand to an arithmetic mean roughness Ra of not more than 0.1 m and a maximum profile height Rt of not more than 1 m.