To provide a reservoir capable of preventing a working fluid from involving air from a suction port.

This reservoir Ta stores the working fluid L and supplies and circulates the working fluid L from the suction port 20 arranged on the bottom part of the reservoir. A plurality of opening parts 22a are formed in the suction port 20. The negative pressure of the working fluid L caused near the suction port 20 is dispersed by a plurality of opening parts 22a.