To provide an accumulator capable of preventing the return of liquid to a compressor by suppressing the turbulence of a liquid surface.

The accumulator A is disposed at a suction side of the compressor in a refrigerant circuit to separate a gaseous refrigerant and a liquid refrigerant. The accumulator is composed of a plurality of container units, and the plurality of container units can communicate with each other through communication openings formed at the container units. The container units are composed of cylindrical bodies closed at both ends, and the plurality of cylindrical bodies are disposed in adjacent to one another.