A refrigeration cycle apparatus comprising: a refrigerant circuit including a compressor , a condenser , and an expansion mechanism , the compressor including a first member and a second member , the first member and the second member being formed of steel, and being not surface-treated; the first member including a first contact portion , the second member including a second contact portion being in contact with the first contact portion of the first member in a slidable manner; a refrigerant mixture inclusive of 1,1,2-trifluoroethylene and used in the refrigerant circuit ; and a refrigerating machine oil that is free of phosphoric ester and used in the refrigerant circuit , and to which 2% or more by weight of an acid scavenger is added, wherein the steel of the first member of the compressor is exposed at the first contact portion , the condenser includes a refrigerant flow path through which the refrigerant mixture flows, and when a portion from an inlet of the refrigerant flow path of the refrigerant mixture to 50% of a total length of the refrigerant flow path is defined as a first refrigerant flow path , and a portion of the refrigerant flow path downstream of the first refrigerant flow path in a refrigerant mixture flow direction is defined as a second refrigerant flow path , an expanded pipe portion is disposed on at least one of the second refrigerant flow path and a pipe between the condenser and the expansion mechanism , the expanded pipe portion having a greater flow path cross-section than the first refrigerant flow path . a refrigerant circuit including a compressor , a condenser , and an expansion mechanism , the compressor including a first member and a second member , the first member and the second member being formed of steel, and being not surface-treated; the first member including a first contact portion , the second member including a second contact portion being in contact with the first contact portion of the first member in a slidable manner; the compressor including a first member and a second member , the first member and the second member being formed of steel, and being not surface-treated; the first member including a first contact portion , the second member including a second contact portion being in contact with the first contact portion of the first member in a slidable manner; a refrigerant mixture inclusive of 1,1,2-trifluoroethylene and used in the refrigerant circuit ; and a refrigerating machine oil that is free of phosphoric ester and used in the refrigerant circuit , and to which 2% or more by weight of an acid scavenger is added, wherein the steel of the first member of the compressor is exposed at the first contact portion , the condenser includes a refrigerant flow path through which the refrigerant mixture flows, and when a portion from an inlet of the refrigerant flow path of the refrigerant mixture to 50% of a total length of the refrigerant flow path is defined as a first refrigerant flow path , and a portion of the refrigerant flow path downstream of the first refrigerant flow path in a refrigerant mixture flow direction is defined as a second refrigerant flow path , an expanded pipe portion is disposed on at least one of the second refrigerant flow path and a pipe between the condenser and the expansion mechanism , the expanded pipe portion having a greater flow path cross-section than the first refrigerant flow path . <EOS>