a cylinder block that rotates about a rotation axis;

a piston disposed in a cylinder bore of the cylinder block; and

a valve plate facing a cylinder port of the cylinder bore,

wherein the valve plate includes:

a high pressure port through which hydraulic oil discharged from the cylinder port flows;

a low pressure port through which hydraulic oil to be sucked into the cylinder port flows;

a first region disposed between the high pressure port and the low pressure port in a circumferential direction of the rotation axis, the first region including a top dead center position facing the cylinder port of the cylinder bore in which the piston having moved to a top dead center is disposed; and

a residual pressure release port provided between the top dead center position and the low pressure port in the first region, and

the residual pressure release port includes a first residual pressure release port and a second residual pressure release port, the second residual pressure release port being disposed at a position different from the first residual pressure release port in a radial direction of the rotation axis,

wherein, in the radial direction, when a distance between the rotation axis and a center of the low pressure port is Rb, a distance between the rotation axis and a center of the first residual pressure release port is R1, and a distance between the rotation axis and a center of the second residual pressure release port is R2, a condition |Rb−R1|<|Rb−R2| is satisfied.