RECLINING APPARATUS FOR SEAT FOR VEHICLE AND SEAT FOR VEHICLE WITH RECLINING APPARATUS

An object of the present invention is to provide a seat for a vehicle which is capable of smoothly and stably adjusting the reclining of a seat back by driving an electrical reclining motor even if the electrical reclining motor is diagonally mounted on a seat back frame structure in a case where the electrical reclining motor is fixedly connected on a seat back frame structure, or even if the electrical reclining motor becomes inclined due to a deformation of the seat back frame structure after such a fixedly connection. There is provided a seat for a vehicle comprising a seat back frame structure a lower end of which is connected to a rear end of a seat cushion frame structure in such a way that the seat back frame structure can be inclined relative to the seat cushion frame structure said seat back frame structure including a pair of side frames A,B each of which extends in a vertical direction of the vehicle, said seat for the vehicle further comprising a through-hole provided on a lower end portion of each of the pair of side frames A,B, a connecting rod extending through each of the through-holes so as to be rotatable about a horizontal direction, an electrical reclining motor rotating said connecting rod and provided along the one of side surfaces of the one of said pair of side frames A,B, and a reclining apparatus provided on the other of the side surfaces of each of said pair of side frames A,B, a bolt through-hole being provided on a non-rotational driven solid portion of said electrical reclining motor a bolt which fits into said bolt through-hole is provided for fixedly bolting said electrical reclining motor on said one of the side surfaces of the one of the pair of side frames A,B, said bolt comprising a head portion and a shank portion with a circular cross-section, said shank portion comprises an enlarged-diameter portion on its end portion and a reduced-diameter portion adjacent to the enlarged-diameter portion with being concentric to each other.