To provide a reinforcing fiber winder capable of winding reinforcing fiber on a rotor so that an outer peripheral surface after winding becomes flat and capable of highly accurately controlling this so that the thickness of the winding layer becomes a prescribed dimension.

In this reinforcing fiber winder 1 comprising a rotor support means 51, a driving motor 52, a fiber bundle delivery part 53, a resin impregnating tank 54 and a rotational driving control part 21, the reinforcing fiber winder comprises a pressing roller 10 arranged in parallel along the axis of the rotor 60, a pressing roller support means 11 for rotatably supporting the pressing roller 10 with the shaft as the center and supporting the pressing roller so as to be capable of contacting and separating to the rotor 60, a contacting separating mechanism part 12 for moving the pressing roller 10 and a contacting separating control part 23 for numerically controlling operation of the contacting separating mechanism part 12.