To provide a hydraulic pump which can easily switch the suction and delivery directions of the hydraulic pump only by switching the rotational direction of a driving shaft, dispensing with a check valve.

This brake device is provided with a cam member 12, an eccentric cam part 17, and a rotary valve 16 which rotate integrally with each other using a motor 1, a piston P which is functionally-engaged with the eccentric cam part 17 and partitions a pressurizing chamber 22, a first passage 24 which communicates with the pressurizing chamber 22, and a second passage 25 which communicates with an actuator. By rotating the rotary valve 16, the first passage 24 can be selectively communicated with either of a reservoir 8 or the second passage 24.