Because of the foregoing, once a piston (23) has been pressed against brake pads (2, 3) by the driving of a motor (32), the bottomed cylindrical member (46) is sandwiched and held so as to be unable to rotate between the annular plate section (80) and the bottom wall (19) by the counterforce on the ball screw (44), and rotation in a release direction of the ball screw (44) is restricted and a braking position is maintained by the clutch mechanism part (47).
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