Brake caliper

A brake caliper comprising:

• a body which includes a pair of side walls disposed with a gap therebetween and a peripheral wall running between the pair of side walls, and in which the pair of side walls and the peripheral wall enclose a peripheral edge portion of a disk rotor from an outside of the disk rotor in a radial direction;
• brake pads positioned between the side walls and the disk rotor;
• pistons that are supported by the side walls and that press the brake pads against side surfaces of the disk rotor by means of applied hydraulic pressure;
• and
• a shaft that supports the brake pads and passes through an opening provided in the side walls,
• wherein the opening includes a retaining part that retains the shaft in a circumferential direction of the disk rotor at two contact points separated from each other along an edge of the opening, and
• wherein the opening includes a narrow part as the retaining part, of which a width is narrower toward one side in the circumferential direction.