To provide an accumulator capable of sucking smoothly oil in from an oil staying initial stage, while compactifying a pressure container.

This accumulator is provided with the pressure container 2 having an inflow port 7 for making a gas-liquid two-phase refrigerant flow in, and a discharge port 8 for discharging a gaseous refrigerant, in its upper part, and a refrigerant discharge member 3 stored in the pressure container 2, and is formed with an inner flow channel 10 and an outer flow channel 11 formed vertically penetratedly in the refrigerant discharge member 3, an upper part 10a of the inner flow channel 10 is connected to communicate with the discharge port 8, an upper part 11a of the outer flow channel 11 is connected to communicate with an inside of the pressure container 2, a lower part 10b of the inner flow channel 10 is connected to communicate with a lower part 11b of the outer flow channel 11 via an adaptor member 12, a prescribed clearance W1 is provided between a bottom part of the pressure container 2 and a bottom part of the adaptor member 12, and an oil suction port 12b is provided in the bottom part of the adaptor member 12.