An oil pressure regulation valve includes a spool supported in a sleeve to be slidable in an axial direction, a solenoid actuator disposed to generate an electromagnetic force for driving the spool to one axial end side, and a biasing portion configured to bias the spool to the other axial end side. The sleeve is provided with an input chamber to which an oil pressure input port is open, and an output chamber to which an oil pressure output port is open. The spool includes a land portion that is exposed to the output chamber to be biased to the one axial end side by using oil pressure in the output chamber, and the spool is movable to the one axial end side when the land portion is biased to the one axial end side by using the oil pressure in the output chamber.