Patent ID: 8857576

Claim:
A disc brake apparatus comprising: a support; a slide pin; a caliper, configured to slide from the support through the slide pin in an axial direction of a rotor; and a boot including a fitting part disposed in a gap between the slide pin and the guide hole, wherein the slide pin is fixed to one of the support and the caliper and is slidably mounted to a guide hole formed in the other of the support and the caliper, a plurality of convex parts extending in a sliding direction of the slide pin are circumferentially arranged on an inner periphery of the fitting part, concave recesses are respectively formed between the neighboring convex parts, each of the convex parts is formed with at least one a low-height portion and a high-height portion in the axial direction of the rotor, respectively, positions of the low-height portion and the high-height portion in a circumferential direction of the rotor are respectively different between the adjacent convex parts, the high-height portion has a height so as to contact the slide pin, and the low-height portion has a height so as not to contact the slide pin.