To provide a compact oil supply device used for control of lubrication and an apparatus to be controlled in oil pressure of a vehicular engine.

A compact oil supply device 100 has a configuration in which a valve element 47 includes a first land 47X and a second land 47Y which each protrude in the radial direction of the valve element 47 with the axis center of the valve element 47 as the center, and a small-diameter part 47a which connects the first land 47X and the second land 47Y in an axial direction and has a diameter smaller than the outer diameters of at least the first land 47X and the second land 47Y. When a first rotation range, a second rotation range, and a third rotation range are set in ascending order of the number of rotations of a rotor 2, the oil supply device is configured to feed operating oil from a second discharge port 32 to a first oil path 61 via the small-diameter part 47a in the first rotation range, feed the operating oil from the second discharge port 32 to a return oil path 66 via the small-diameter part 47a in the second rotation range, and feed the operating oil from the second discharge port 32 to the first oil path 61 in the third rotation range after a second oil path 62 is shut off from the return oil path 66 by the second land 47y.