An accumulator connectable to a refrigerant circuit, the accumulator comprising: a container sealing low pressure refrigerant; a low pressure refrigerant inlet tube allowing the low pressure refrigerant to flow into the container; a low pressure refrigerant outlet body including an upstream-side tubular section, a low pressure refrigerant turning back section communicating with a lower end of the upstream-side tubular section, and a downstream-side tubular section having a lower end communicating with the low pressure refrigerant turning back section in the container, and is configured to allow the low pressure refrigerant in the container to flow from an upper end of the upstream-side tubular section to an upper end of the downstream-side tubular section and to flow out of the container; a high pressure refrigerant inlet tube allowing high pressure refrigerant to flow into the container; and a high pressure refrigerant outlet tube allowing the high pressure refrigerant to flow out of the container, at least a part of the upstream-side tubular section being covered by a first outer tube with a gap between the upstream-side tubular section and the first outer tube, at least a part of the downstream-side tubular section being covered by a second outer tube with a gap between the downstream-side tubular section and the second outer tube, characterised by the first outer tube and the second outer tube communicating with each other via a bridging tube, the first outer tube being connected to the high pressure refrigerant outlet tube, the second outer tube being connected to the high pressure refrigerant inlet tube, the high pressure refrigerant being able of passing through the gap between the upstream-side tubular section and the first outer tube, the bridging tube, and the gap between the downstream-side tubular section and the second outer tube. a container sealing low pressure refrigerant; a low pressure refrigerant inlet tube allowing the low pressure refrigerant to flow into the container; a low pressure refrigerant outlet body including an upstream-side tubular section, a low pressure refrigerant turning back section communicating with a lower end of the upstream-side tubular section, and a downstream-side tubular section having a lower end communicating with the low pressure refrigerant turning back section in the container, and is configured to allow the low pressure refrigerant in the container to flow from an upper end of the upstream-side tubular section to an upper end of the downstream-side tubular section and to flow out of the container; a high pressure refrigerant inlet tube allowing high pressure refrigerant to flow into the container; and a high pressure refrigerant outlet tube allowing the high pressure refrigerant to flow out of the container, at least a part of the upstream-side tubular section being covered by a first outer tube with a gap between the upstream-side tubular section and the first outer tube, at least a part of the downstream-side tubular section being covered by a second outer tube with a gap between the downstream-side tubular section and the second outer tube, characterised by the first outer tube and the second outer tube communicating with each other via a bridging tube, the first outer tube being connected to the high pressure refrigerant outlet tube, the second outer tube being connected to the high pressure refrigerant inlet tube, the high pressure refrigerant being able of passing through the gap between the upstream-side tubular section and the first outer tube, the bridging tube, and the gap between the downstream-side tubular section and the second outer tube.