A turbine wheel comprising: a disk which has a shape rotationally symmetrical about an axis (Ar) and a diameter which gradually decreases from a front side (Daf) which is one side in an axial direction (Da) in which the axis (Ar) extends toward a rear side (Dab) which is the other side; a plurality of blades which are fixed to an outer peripheral surface of the disk at intervals in a circumferential direction with respect to the axis (Ar), wherein each of the blades includes a leading edge which extends in a direction including an axial component from a portion on the front side (Daf) of the disk and faces a radially outer side with respect to the axis (Ar), a trailing edge which extends in a direction including a radial component with respect to the axis (Ar) from a portion on the rear side (Dab) of the disk and faces the rear side (Dab), a pressure surface and a suction surface which extend from the leading edge to the trailing edge and face sides opposite to each other, a tip which forms an edge on a side far from the outer peripheral surface, wherein the suction surface includes a leading edge side of blade tip including a boundary between the suction surface and the tip and the leading edge, a trailing edge side of blade tip including a boundary between the suction surface and the tip and the trailing edge, and a root portion which includes a boundary between the suction surface and the outer peripheral surface, the leading edge, and the trailing edge, and is in contact with the leading edge side of blade tip and the trailing edge side of blade tip, wherein the leading edge side of blade tip forms a concave curved surface which is recessed to an counterrotation side (So) from the suction surface toward the pressure surface when viewed in a radial direction (Dr), and wherein the trailing edge side of blade tip forms a convex curved surface which protrudes to a rotation side (Sr) from the pressure surface toward the suction surface when viewed in the radial direction (Dr), characterised in that the entire root portion of the suction surface forms a convex curved surface which protrudes to the rotation side (Sr) when viewed in the radial direction (Dr), wherein a boundary line between the leading edge side of blade tip and the root portion is positioned at a position which is less than half a blade height from the tip in a blade height direction, and wherein in the suction surface, the leading edge side of blade tip, the trailing edge side of blade tip, and the root portion are formed to not to overlap each other. a disk which has a shape rotationally symmetrical about an axis (Ar) and a diameter which gradually decreases from a front side (Daf) which is one side in an axial direction (Da) in which the axis (Ar) extends toward a rear side (Dab) which is the other side; a plurality of blades which are fixed to an outer peripheral surface of the disk at intervals in a circumferential direction with respect to the axis (Ar), wherein each of the blades includes a leading edge which extends in a direction including an axial component from a portion on the front side (Daf) of the disk and faces a radially outer side with respect to the axis (Ar), a trailing edge which extends in a direction including a radial component with respect to the axis (Ar) from a portion on the rear side (Dab) of the disk and faces the rear side (Dab), a pressure surface and a suction surface which extend from the leading edge to the trailing edge and face sides opposite to each other, a tip which forms an edge on a side far from the outer peripheral surface, wherein the suction surface includes a leading edge side of blade tip including a boundary between the suction surface and the tip and the leading edge, a trailing edge side of blade tip including a boundary between the suction surface and the tip and the trailing edge, and a root portion which includes a boundary between the suction surface and the outer peripheral surface, the leading edge, and the trailing edge, and is in contact with the leading edge side of blade tip and the trailing edge side of blade tip, wherein the leading edge side of blade tip forms a concave curved surface which is recessed to an counterrotation side (So) from the suction surface toward the pressure surface when viewed in a radial direction (Dr), and wherein the trailing edge side of blade tip forms a convex curved surface which protrudes to a rotation side (Sr) from the pressure surface toward the suction surface when viewed in the radial direction (Dr), characterised in that the entire root portion of the suction surface forms a convex curved surface which protrudes to the rotation side (Sr) when viewed in the radial direction (Dr), wherein a boundary line between the leading edge side of blade tip and the root portion is positioned at a position which is less than half a blade height from the tip in a blade height direction, and wherein in the suction surface, the leading edge side of blade tip, the trailing edge side of blade tip, and the root portion are formed to not to overlap each other.