Disk brake device

A disk brake device comprising:

• a disk rotor rotatable integrally with a wheel;
• a supporting body assembled to a vehicle body;
• a pair of brake pads that includes a back plate supported by the supporting body so as to be movable along an axial direction of the disk rotor and a lining fixed to the back plate, and that sandwiches the disk rotor;
• a pushing member that is assembled to the supporting body and that pushes the back plate toward the disk rotor;
• a convex portion that is formed on a circumferential end of the back plate in a circumferential direction of the disk rotor and that projects out from the circumferential end;
• a concave portion that is formed on the supporting body and that accommodates the convex portion so as to be movable in the axial direction of the disk rotor, a radial direction and the circumferential direction of the disk rotor;
• and
• an elastic member that is interposed between the convex portion and the concave portion in an assembled state of being assembled to the concave portion and that holds the back plate while biasing, wherein the elastic member is configured to include,
• in the assembled state, a U-shaped portion having an outer peripheral surface portion that abuts against an outward side inner peripheral surface of the concave portion to be the outward side in the radial direction, an inner peripheral surface portion that is configured to abut against an inward side inner peripheral surface of the concave portion to be an inward side in the radial direction, and a linking surface portion that links the outer peripheral surface portion and the inner peripheral surface portion and that abuts against a connecting surface connecting the outward side inner peripheral surface and the inward side inner peripheral surface,
• a spring portion that extends from the inner peripheral surface portion so as to incline along the axial direction between the outer peripheral surface portion and the inner peripheral surface portion and that separates the back plate away from the disk rotor,
• a cutout portion provided by cutting out a part of the linking surface portion and the inner peripheral surface portion in continuation from the linking surface portion toward the inner peripheral surface portion,
• in an unassembled state of not being assembled to the concave portion, a tongue piece portion that is formed in the cutout portion, that has a base end provided on the side closer to the outer peripheral surface portion than the spring portion in the radial direction and which distal end projects out toward the inward side inner peripheral surface from an opposing surface opposing the inward side inner peripheral surface of the inner peripheral surface portion, and that elastically deforms in the radial direction to press the brake pad outward together with the U-shaped portion in the assembled state, and
• a first slit portion provided by cutting out a part of a first linking part linking the outer peripheral surface portion and the linking surface portion.