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 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 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 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 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 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 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.