A brake fluid pressure control unit that can improve installability of a brake system in a motorcycle is obtained. A brake system for a motorcycle that includes such a brake fluid pressure control unit is also obtained.A brake fluid pressure control unit 50 includes: a first primary base body 31 provided with an inlet valve 21 and an outlet valve 22 of a first hydraulic circuit 2; a first secondary base body 32 provided with a pressurizing/transferring mechanism 25 of the first hydraulic circuit 2; a second primary base body 33 provided with an inlet valve 21 and an outlet valve 22 of a second hydraulic circuit 3; and a second secondary base body 34 provided with a pressurizing/transferring mechanism 25 of the second hydraulic circuit 3, and the first primary base body 31, the first secondary base body 32, the second primary base body 33, and the second secondary base body 34 are separated.