A refrigeration cycle apparatus comprising: a compressor ; a condenser ; an indoor expansion valve ; a subcooling circuit that is disposed between the condenser and the indoor expansion valve ; an evaporator ; and a refrigerant pipe that connects the compressor , the condenser , the subcooling circuit , the indoor expansion valve , and the evaporator , and circulates a refrigerant, wherein the refrigerant pipe includes: a main circuit pipe that circulates the refrigerant through the compressor , the condenser , the subcooling circuit , the indoor expansion valve , and the evaporator ; a bypass circuit pipe that branches from the middle of the main circuit pipe connecting the subcooling circuit to the indoor expansion valve and bypasses the refrigerant to the compressor ; and a branch portion that connects the main circuit pipe and the bypass circuit pipe , and wherein the branch portion includes an upstream pipe portion , a main-circuit branch pipe portion and a bypass-circuit branch pipe portion , characterized in that the main-circuit branch pipe portion branches upward from the upstream pipe portion toward the indoor expansion valve ; and the bypass-circuit branch pipe portion branches downward from the upstream pipe portion and extends toward the subcooling circuit ; the main-circuit branch pipe portion and the bypass-circuit branch pipe portion constitute a continuous straight pipe ; the upstream pipe portion is connected to the straight pipe in a tee-shape; and a flow-path cross-sectional area of the straight pipe is twice a flow-path cross-sectional area of the upstream pipe portion or more. a compressor ; a condenser ; an indoor expansion valve ; a subcooling circuit that is disposed between the condenser and the indoor expansion valve ; an evaporator ; and a refrigerant pipe that connects the compressor , the condenser , the subcooling circuit , the indoor expansion valve , and the evaporator , and circulates a refrigerant, wherein the refrigerant pipe includes: a main circuit pipe that circulates the refrigerant through the compressor , the condenser , the subcooling circuit , the indoor expansion valve , and the evaporator ; a bypass circuit pipe that branches from the middle of the main circuit pipe connecting the subcooling circuit to the indoor expansion valve and bypasses the refrigerant to the compressor ; and a branch portion that connects the main circuit pipe and the bypass circuit pipe , and wherein the branch portion includes an upstream pipe portion , a main-circuit branch pipe portion and a bypass-circuit branch pipe portion , characterized in that the main-circuit branch pipe portion branches upward from the upstream pipe portion toward the indoor expansion valve ; and the bypass-circuit branch pipe portion branches downward from the upstream pipe portion and extends toward the subcooling circuit ; the main-circuit branch pipe portion and the bypass-circuit branch pipe portion constitute a continuous straight pipe ; the upstream pipe portion is connected to the straight pipe in a tee-shape; and a flow-path cross-sectional area of the straight pipe is twice a flow-path cross-sectional area of the upstream pipe portion or more. <EOS>