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 (33, 33A) that connects the main circuit pipe and the bypass circuit pipe, and wherein the branch portion(33, 33A) 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 (33, 33A) that connects the main circuit pipe and the bypass circuit pipe, and wherein the branch portion(33, 33A) 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.