A vehicle disc brake comprising: a caliper bracket provided securely to a vehicle body; a disc rotor comprising an outer edge; a caliper body; friction pads disposed to hold the disc rotor between the friction pads, each friction pad comprising a back plate; and pad retainers, wherein a pair of caliper support arms are provided on the caliper bracket so as to be extended, wherein the pair of caliper support arms straddle the outer edge of the disc rotor in a direction of a disc axis and support the caliper body, wherein a pair of pad guide portions are provided in the caliper support arms so as to face each other, wherein lug pieces are provided at both ends of the back plates of the friction pads so as to be projected, wherein the lug pieces are movably supported in the pad guide portions with the pad retainers between the lug pieces and the pad guide portions, wherein each of the pair of pad guide portions comprises a torque bearing face, the torque bearing face of one of the pair of pad guide portions facing a torque bearing face of the other pad guide portion of the pair of pad guide portions, and a lug piece movably supporting face that projects from an inner side of the torque bearing face in a disc radial direction at a right angle with respect to the disc radial direction, wherein each of the pad retainers comprises a pair of retainer portions which are disposed on the torque bearing faces, a pair of pad spring-back pieces which project from inner sides of the retainer portions in the disc radial direction and which are disposed on the lug piece movably supporting faces, and a connecting piece which connects outer sides of the pair of retainer portions in the disc radial direction, and characterised in that each of the pad spring-back pieces comprises a spring-back portion which extends from a base end portion thereof which is situated at a side facing the retainer portion in a projecting direction of the lug piece movably supporting face and which is inclined gradually inwards in the disc radial direction from the base end portion towards a distal end portion, so that the distal end portion is allowed to be brought into abutment with the lug piece movably supporting face, in such a state that the lug piece is assembled to the pad guide portion with the pad retainer between the lug piece and the pad guide portion and a pad abutment portion which extends outwards in the disc radial direction from the spring-back portion so as to be brought into abutment with a disc radial direction inner face of the lug piece. a caliper bracket provided securely to a vehicle body; a disc rotor comprising an outer edge; a caliper body; friction pads disposed to hold the disc rotor between the friction pads, each friction pad comprising a back plate; and pad retainers, wherein a pair of caliper support arms are provided on the caliper bracket so as to be extended, wherein the pair of caliper support arms straddle the outer edge of the disc rotor in a direction of a disc axis and support the caliper body, wherein a pair of pad guide portions are provided in the caliper support arms so as to face each other, wherein lug pieces are provided at both ends of the back plates of the friction pads so as to be projected, wherein the lug pieces are movably supported in the pad guide portions with the pad retainers between the lug pieces and the pad guide portions, wherein each of the pair of pad guide portions comprises a torque bearing face, the torque bearing face of one of the pair of pad guide portions facing a torque bearing face of the other pad guide portion of the pair of pad guide portions, and a lug piece movably supporting face that projects from an inner side of the torque bearing face in a disc radial direction at a right angle with respect to the disc radial direction, wherein each of the pad retainers comprises a pair of retainer portions which are disposed on the torque bearing faces, a pair of pad spring-back pieces which project from inner sides of the retainer portions in the disc radial direction and which are disposed on the lug piece movably supporting faces, and a connecting piece which connects outer sides of the pair of retainer portions in the disc radial direction, and characterised in that each of the pad spring-back pieces comprises a spring-back portion which extends from a base end portion thereof which is situated at a side facing the retainer portion in a projecting direction of the lug piece movably supporting face and which is inclined gradually inwards in the disc radial direction from the base end portion towards a distal end portion, so that the distal end portion is allowed to be brought into abutment with the lug piece movably supporting face, in such a state that the lug piece is assembled to the pad guide portion with the pad retainer between the lug piece and the pad guide portion and a pad abutment portion which extends outwards in the disc radial direction from the spring-back portion so as to be brought into abutment with a disc radial direction inner face of the lug piece.