A refrigeration cycle apparatus comprising a turbo compressor comprising: a casing ; and an impeller disposed inside the casing , wherein the impeller has a hub with an upper surface , a lower surface , and an outer peripheral surface and a plurality of blades radially disposed on the outer peripheral surface of the hub , each of the plurality of blades includes a front edge positioned at a side of the upper surface of the hub , a rear edge positioned at a side of the lower surface of the hub , a hub edge contacting the outer peripheral surface of the hub , and a shroud edge being a blade end positioned at an outer side in a span direction, when a distance from a rotation axis (O) of the impeller to an intersection point between the front edge and the hub edge is defined as R1, a distance from the rotation axis (O) of the impeller to an intersection point between the front edge and the shroud edge is defined as R2, and a distance from the rotation axis (O) of the impeller to the rear edge is defined as R3, the distance R1, the distance R2, and the distance R3 satisfy relations of 0.2≤R1/R3≤0.3 and 0.6≤R2/R3≤0.8, and when a dimensionless distance from the front edge with respect to a code direction is defined as M, a blade angle βs at the shroud edge is unchanged in a section where the dimensionless distance M is 0% or higher and 5% or lower, wherein a blade angle βh at the hub edge and the blade angle βs at the shroud edge satisfy a relation of βh≥βs×2/3 in a position where the dimensionless distance M is 5%, and a substance having a saturated vapor pressure being negative at a normal temperature of 20oC±15oC is used as a refrigerant. a casing ; and an impeller disposed inside the casing , wherein the impeller has a hub with an upper surface , a lower surface , and an outer peripheral surface and a plurality of blades radially disposed on the outer peripheral surface of the hub , each of the plurality of blades includes a front edge positioned at a side of the upper surface of the hub , a rear edge positioned at a side of the lower surface of the hub , a hub edge contacting the outer peripheral surface of the hub , and a shroud edge being a blade end positioned at an outer side in a span direction, when a distance from a rotation axis (O) of the impeller to an intersection point between the front edge and the hub edge is defined as R1, a distance from the rotation axis (O) of the impeller to an intersection point between the front edge and the shroud edge is defined as R2, and a distance from the rotation axis (O) of the impeller to the rear edge is defined as R3, the distance R1, the distance R2, and the distance R3 satisfy relations of 0.2≤R1/R3≤0.3 and 0.6≤R2/R3≤0.8, and when a dimensionless distance from the front edge with respect to a code direction is defined as M, a blade angle βs at the shroud edge is unchanged in a section where the dimensionless distance M is 0% or higher and 5% or lower, wherein a blade angle βh at the hub edge and the blade angle βs at the shroud edge satisfy a relation of βh≥βs×2/3 in a position where the dimensionless distance M is 5%, and a substance having a saturated vapor pressure being negative at a normal temperature of 20oC±15oC is used as a refrigerant. <EOS>