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An engaging projection formed on a back surface of a pressure plate is inserted into an engaging hole formed in an outside shim plate. A flat surface parts of the engaging projection constituting a side surface thereof are opposed to a linear parts of the engaging hole constituting an inner peripher

An engaging projection formed on a back surface of a pressure plate is inserted into an engaging hole formed in an outside shim plate. A flat surface parts of the engaging projection constituting a side surface thereof are opposed to a linear parts of the engaging hole constituting an inner peripheral edge thereof. When the outside shim plate exists at a neutral position with respect to the pressure plate, the flat surface parts and linear parts are slightly inclined with respect to each other. A rotation of the outside shim plate about an axis of a piston based on a rotation force applied from a leading end face of the piston to the outside shim plate is regulated by line contact between the flat surface parts and linear parts.

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1. A pad assembly for a disc brake, the pad assembly comprising: a pad in which a lining is fixedly attached to a front surface of a pressure plate, and which is to be arranged to face an axial-direction side surface of a rotor; anda shim plate having a back surface to be pressed by a leading end fa

1. A pad assembly for a disc brake, the pad assembly comprising: a pad in which a lining is fixedly attached to a front surface of a pressure plate, and which is to be arranged to face an axial-direction side surface of a rotor; anda shim plate having a back surface to be pressed by a leading end face of a piston,wherein the shim plate includes a′flat plate-shaped main body and a locking piece folded from a peripheral edge of the main body toward the pressure plate,wherein the locking piece is engaged with a peripheral edge of the pressure plate in a state where a front surface of the main body is superimposed directly or through another shim plate on a back surface of the pressure plate,wherein the pressure plate includes, in a part of the back surface of the pressure plate which is shifted from a part of the pressure plate opposed to the leading end face of the piston, an engaging projection projecting in an axial direction of the rotor,wherein the engaging projection is inserted into an engaging hole formed in a part of the main body of the shim plate which is shifted from a part of the main body to be contacted with the leading end face of the piston in a state where a flat surface part of the engaging projection constituting a side surface of the engaging projection and a linear part of the engaging hole constituting an inner peripheral edge of the engaging hole are opposed to each other and where the flat surface part and the linear part are inclined to each other with the shim plate existing at a neutral position with respect to the pressure plate,wherein, of shifting movements of the shim plate relative to the pressure plate, a movement of the shim plate in a circumferential direction of the rotor is regulated by an engagement between the locking piece and the inner peripheral edge of the pressure plate,wherein, of a rotation of the shim plate about an axis of the piston, a rotation in a direction to act on the piston at least in braking is regulated, by a line contact between the flat surface part and the linear part, andwherein, in a state where the shim plate exists at the neutral position with respect to the pressure plate, an inclination angle between the flat surface part and the linear part is in the range of 0° to 15°. 2. The pad assembly for a disc brake according to claim 1, wherein the engaging projections are formed on the back surface of the pressure plate in both sides in the circumferential direction across the part of the pressure plate opposed to the leading end face of the piston, and wherein the engaging holes are formed on the main body of the shim plate in both sides in the circumferential direction across the part of the main body to be contacted with the leading end face of the piston. 3. The pad assembly for a disc brake according to claim 1, wherein a pair of flat surface parts are formed in the side surface of the engaging projection, a pair of linear parts are formed in the inner peripheral edge of the engaging hole, and the rotation of the shim plate in both directions about the axis of the piston is regulated by line contact between the flat surface parts and the linear parts. 4. The pad assembly for a disc brake according to claim 1, wherein the locking pieces are formed in outer and inner peripheral edges of the main body at least apiece. 5. A pad assembly for a disc brake, the pad assembly comprising: a pad in which a lining is fixedly attached to a front surface of a pressure plate, and which is to be arranged to face an axial-direction side surface of a rotor;a shim plate having a back surface to be pressed by a leading end face of a piston,wherein the shim plate includes a flat plate-shaped main body and a locking piece folded from a peripheral edge of the main body toward the pressure plate,wherein the locking piece is engaged with a peripheral edge of the pressure plate in a state where a front surface of the main body is superimposed directly or through another shim plate on a back surface of the pressure plate,wherein the pressure plate includes, in a part of the back surface of the pressure plate which is shifted from a part of the pressure plate opposed to the leading end face of the piston, an engaging projection projecting in an axial direction of the rotor,wherein the engaging projection is inserted into an engaging hole formed in a part of the main body of the shim plate which is shifted from a part of the main body to be contacted with the leading end face of the piston in a state where a flat surface part of the engaging projection constituting a side surface of the engaging projection and a linear part of the engaging hole constituting an inner peripheral edge of the engaging hole are opposed to each other and where the flat surface part and the linear part are inclined to each other with the shim plate existing at a neutral position with respect to the pressure plate,wherein, of shifting movements of the shim plate relative to the pressure plate, a movement of the shim plate in a circumferential direction of the rotor is regulated by an engagement between the locking piece and the inner peripheral edge of the pressure plate, andwherein, of a rotation of the shim plate about an axis of the piston, a rotation in a direction to act on the piston at least in braking is regulated by a line contact between the flat surface part and the linear part; anda folded part folded at the inner peripheral edge of the engaging hole in a opposite direction from the pressure plate, wherein an inside surface of the folded part serves as the linear part.