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 . <EOS>