A turbine rotor comprising: a turbine wheel obtainable by precision casting of titanium aluminide, including a hub extending along a rotational center of the turbine wheel, and a plurality of impellers arranged along a circumferential direction around an outer circumference of the hub, and having a web-like scallop formed by making a cutout between adjacent impellers among the plurality of the impellers; and a rotor shaft extending along the rotational center line of the turbine wheel on a back side of the hub of the turbine wheel; wherein the turbine wheel has a balance cut portion arranged along the circumferential direction of the rotational turbine wheel on the back side of the hub of the turbine wheel, characterized in that an area of the balance cut portion arranged in the circumferential direction is placed so that a diameter of the area arranged in the circumferential direction on an inner circumferential side (i.e. a balance cut minimum diameter BCmin) is larger than a maximum diameter of the rotor shaft on the wheel mounting side, and that a diameter of the area arranged in the circumferential direction on an outer circumferential side (i.e. a balance cut maximum diameter BCmax) is smaller than a scallop diameter S of the turbine wheel, and that a thickness t from the back side of the turbine wheel to a surface of the hub at the position of the balance cut maximum diameter BCmax_satisfies 1.75t ≥ w, where w is a width in a radial direction of the area arranged in the circumferential direction (i.e. balance cut), and wherein the balance cut portion is set to be such that a cut depth Dp at a position of the balance cut maximum diameter BCmax satisfies the following relational expression: Dp < thickness t from the back side of the turbine wheel to the surface of the hub at the position of BCmax − Dp. a turbine wheel obtainable by precision casting of titanium aluminide, including a hub extending along a rotational center of the turbine wheel, and a plurality of impellers arranged along a circumferential direction around an outer circumference of the hub, and having a web-like scallop formed by making a cutout between adjacent impellers among the plurality of the impellers; and a rotor shaft extending along the rotational center line of the turbine wheel on a back side of the hub of the turbine wheel; wherein the turbine wheel has a balance cut portion arranged along the circumferential direction of the rotational turbine wheel on the back side of the hub of the turbine wheel, characterized in that an area of the balance cut portion arranged in the circumferential direction is placed so that a diameter of the area arranged in the circumferential direction on an inner circumferential side (i.e. a balance cut minimum diameter BCmin) is larger than a maximum diameter of the rotor shaft on the wheel mounting side, and that a diameter of the area arranged in the circumferential direction on an outer circumferential side (i.e. a balance cut maximum diameter BCmax) is smaller than a scallop diameter S of the turbine wheel, and that a thickness t from the back side of the turbine wheel to a surface of the hub at the position of the balance cut maximum diameter BCmax_satisfies 1.75t ≥ w, where w is a width in a radial direction of the area arranged in the circumferential direction (i.e. balance cut), and wherein the balance cut portion is set to be such that a cut depth Dp at a position of the balance cut maximum diameter BCmax satisfies the following relational expression: Dp < thickness t from the back side of the turbine wheel to the surface of the hub at the position of BCmax − Dp.