Fiber-reinforced resin sheet manufacturing method and manufacturing apparatus

Providing a fiber-reinforced resin sheet manufacturing method capable of satisfactorily impregnate the thermoplastic resin into the reinforcing fiber substrate. A reinforcing fiber base material F-shaped sheet, and a thermoplastic resin P, the pair of impregnation rolls 10A, and introduced between 10B, a pair of impregnation rolls 10A, thermoplastic resin P in the reinforcing fiber base material F while rotating the 10B by impregnating to produce a fiber-reinforced resin sheet S. A pair of impregnation rolls 10A, on the surface of 10B, as well as elastically deformed along the thickness direction by pressing between impregnation roll, so as to allow release of the thermoplastic resin P during pressing, a layer of thermoplastic resin P melted resin holding layer 12 holding is formed within, by pressing the impregnated rolls are, while the resin holding layer 12 is elastically deformed, is impregnated with a thermoplastic resin P to the fiber reinforced base F.