DISC BRAKE

PROBLEM TO BE SOLVED: To provide a disc brake capable of suppressing deformation of a seal groove of a cylinder member.SOLUTION: A caliper 15 is configured so that a cylinder member 71 in which a piston 63 is arranged is coupled to a bridge member 72 formed separately from the cylinder member 71 and extending from the cylinder member 71 to stride over a disc 11 and to press a friction pad 13. The bridge member 72 includes: a fixing portion 120 to which the cylinder member 71 is fixed; a bridge portion 121 extending from the fixing portion 120 in a disk axial direction to stride over an outer circumference of the disc 11; and a claw 122 extending from the bridge portion 121 in a disc radial direction and abutting on the friction pad 13. A protrusion 77 having an abutment surface 77a abutting on a claw 122-side of the fixing portion 120 of the bridge member 72 is formed on an outer circumference of the cylinder member 71 to protrude radially outward, the abutment surface 77a being arranged near a bottom 85 of the cylinder member 71 with respect to a seal groove 106. 【課題】シリンダ部材のシール溝の変形を抑制することができるディスクブレーキの提供。【解決手段】キャリパ１５が、ピストン６３が配置されるシリンダ部材７１と、シリンダ部材７１と別体に形成され、シリンダ部材７１からディスク１１を跨いで延出して摩擦パッド１３を押圧するブリッジ部材７２と、が結合されてなり、ブリッジ部材７２には、シリンダ部材７１が固定される固定部１２０と、固定部１２０からディスク軸方向に延出してディスク１１の外周を跨ぐブリッジ部１２１と、ブリッジ部１２１からディスク径方向に延出して摩擦パッド１３に当接する爪部１２２とを有し、シリンダ部材７１の外周に、ブリッジ部材７２の固定部１２０の爪部１２２側に当接する当接面７７ａを有する突出部７７が径方向外側に突出して形成され、当接面７７ａが、シール溝１０６よりもシリンダ部材７１の底部８５側に配置されている。【選択図】図４