An actuator for brake fluid pressure control includes a block formed with a brake pipe, an electric component provided on a surface of the block, a circuit board formed with an electric circuit for driving the electric component, and a case that houses the circuit board and includes a first open part in which the electric component is accommodated, the case having a top surface opposite the surface of the block across the circuit board and being fixed to the block at the side opposite to the top surface. An insertion hole is formed in a side surface of the case at a position corresponding to a plane position of the circuit board. The insertion hole is sized to enable inserting the circuit board into the case therethrough to be fixed to the case.