VANE PUMP

A vane pump in which noise can be suppressed is provided. A vane pump (1) includes: a housing (2) having a peripheral wall portion (200), a bottom wall portion (201), and a pump chamber (A); a rotor (3) disposed in the pump chamber (A) to be rotatable; a vane (4) disposed to be slidable in the radial direction with respect to the rotor (3) and partitioning the pump chamber (A) into working chambers (A1, A2); and a reed valve (5) that opens and closes a discharge hole (201a) of the bottom wall portion (201). A position at which the sliding direction of the vane (4) with respect to the rotor (3) is inverted from outward in the radial direction to inward is defined as a reference position (θ1), and a section of the pump chamber (A) on the discharge hole (201a) side with respect to the reference position (θ1) is defined as a discharge section (AD). A pressure relief groove (201b) is disposed in a portion of the bottom wall portion (201) corresponding to the discharge section (AD) with a clearance (E) secured between the peripheral wall portion (200) and the pressure relief groove (201b). When the vane (4) overlaps the pressure relief groove (201b), a pair of the working chambers (A1, A2) on both sides of the vane (4) in the rotational direction communicate with each other via the pressure relief groove (201b).