A hydraulic pressure control unit for an anti-lock braking operation of a straddle-type vehicle brake system, the hydraulic pressure control unit comprising: a base body formed with: a master cylinder port (MP1, MP2) for connecting a fluid pipe communicating with a master cylinder (21, 41) thereto; a wheel cylinder port (WP1, WP2) for connecting a fluid pipe communicating with a wheel cylinder (24, 44) thereto; a primary channel (25, 45) that communicates the master cylinder port (MP1, MP2) and the wheel cylinder port (WP1, WP2) via an inlet valve (28, 48); and a secondary channel (26, 46) for releasing a brake fluid in the wheel cylinder port(WP1, WP2) to the master cylinder port (MP1, MP2) via an outlet valve (29, 49); a booster valve (33, 53) configured to be brought into an open state in an automatic pressure boosting operation of the straddle-type vehicle brake system; a pump (31, 51) provided in the secondary channel (26, 46); and a motor as a drive source of the pump (31, 51), wherein the inlet valve (28, 48) and the outlet valve (29, 49) are provided in valve holes (81, 82, 85, 86) formed on a first surface of the base body, the motor is provided in an upright manner in a motor hole that is provided on the first surface of the base body, one of the master cylinder port (MP1, MP2) and the wheel cylinder port (WP1, WP2) is provided on a second surface that is a surface opposing the first surface of the base body, and the other of the master cylinder port (MP1, MP2) and the wheel cylinder port (WP1, WP2) is provided on a third surface of the base body, the third surface constituting one end of the base body in a direction that is parallel with a reference surface and is orthogonal to a center axis of the motor hole, the reference surface including the center axis of the motor hole, the base body is formed with a booster channel (27, 47), through which the brake fluid in the master cylinder port (MP1, MP2) is supplied to a portion of the secondary channel (26, 46) upstream of the pump (31, 51) via the booster valve (33, 53), and the booster valve (33, 53) is embedded in a booster valve hole (84, 88) in a manner to be able to open or close the booster channel (27, 47), the booster valve hole (84, 88) being formed in the first surface. a base body formed with: a master cylinder port (MP1, MP2) for connecting a fluid pipe communicating with a master cylinder (21, 41) thereto; a wheel cylinder port (WP1, WP2) for connecting a fluid pipe communicating with a wheel cylinder (24, 44) thereto; a primary channel (25, 45) that communicates the master cylinder port (MP1, MP2) and the wheel cylinder port (WP1, WP2) via an inlet valve (28, 48); and a secondary channel (26, 46) for releasing a brake fluid in the wheel cylinder port(WP1, WP2) to the master cylinder port (MP1, MP2) via an outlet valve (29, 49); a booster valve (33, 53) configured to be brought into an open state in an automatic pressure boosting operation of the straddle-type vehicle brake system; a pump (31, 51) provided in the secondary channel (26, 46); and a motor as a drive source of the pump (31, 51), wherein the inlet valve (28, 48) and the outlet valve (29, 49) are provided in valve holes (81, 82, 85, 86) formed on a first surface of the base body, the motor is provided in an upright manner in a motor hole that is provided on the first surface of the base body, one of the master cylinder port (MP1, MP2) and the wheel cylinder port (WP1, WP2) is provided on a second surface that is a surface opposing the first surface of the base body, and the other of the master cylinder port (MP1, MP2) and the wheel cylinder port (WP1, WP2) is provided on a third surface of the base body, the third surface constituting one end of the base body in a direction that is parallel with a reference surface and is orthogonal to a center axis of the motor hole, the reference surface including the center axis of the motor hole, the base body is formed with a booster channel (27, 47), through which the brake fluid in the master cylinder port (MP1, MP2) is supplied to a portion of the secondary channel (26, 46) upstream of the pump (31, 51) via the booster valve (33, 53), and the booster valve (33, 53) is embedded in a booster valve hole (84, 88) in a manner to be able to open or close the booster channel (27, 47), the booster valve hole (84, 88) being formed in the first surface.