A scroll compressor comprising: a compression unit including a stationary scroll and an orbiting scroll that are combined to define a compression chamber, the orbiting scroll being driven to compress a fluid in the compression chamber; a crankshaft configured to drive the orbiting scroll, the crankshaft having an eccentric pin configured to impart a rotational force to the orbiting scroll; an orbiting bearing configured to support the orbiting scroll; and a bush (70, 70a) having a shaft part disposed between the orbiting bearing and the eccentric pin of the crankshaft, and a balance weight part secured to an outer periphery of the shaft part, wherein the shaft part includes a cylindrical body part fitted into the orbiting bearing and into which the eccentric pin of the crankshaft is inserted, and a cylindrical coupling part extending outward from an end portion in an axial direction of the body part and to which the balance weight part is joined, characterized in that the balance weight part is secured to an outer periphery of the shaft part by shrink-fitting or press-fitting, and the bush (70, 70a) satisfies requirements including 1.2 ≤ D 2 / D1 ≤ 1.6, and 1,0 ≤ D 2 − D 3 / D 4 − D 2 × E 1 / E 2 ≤ 3,5, where D1 is an outer diameter of the body part, D2 is an outer diameter of the coupling part, D3 is an inner diameter of the body part, D4 is an outer diameter of the balance weight part, E1 is a Young's modulus of the shaft part, and E2 is a Young's modulus of the balance weight part. a compression unit including a stationary scroll and an orbiting scroll that are combined to define a compression chamber, the orbiting scroll being driven to compress a fluid in the compression chamber; a crankshaft configured to drive the orbiting scroll, the crankshaft having an eccentric pin configured to impart a rotational force to the orbiting scroll; an orbiting bearing configured to support the orbiting scroll; and a bush (70, 70a) having a shaft part disposed between the orbiting bearing and the eccentric pin of the crankshaft, and a balance weight part secured to an outer periphery of the shaft part, wherein the shaft part includes a cylindrical body part fitted into the orbiting bearing and into which the eccentric pin of the crankshaft is inserted, and a cylindrical coupling part extending outward from an end portion in an axial direction of the body part and to which the balance weight part is joined, characterized in that the balance weight part is secured to an outer periphery of the shaft part by shrink-fitting or press-fitting, and the bush (70, 70a) satisfies requirements including 1.2 ≤ D 2 / D1 ≤ 1.6, and 1,0 ≤ D 2 − D 3 / D 4 − D 2 × E 1 / E 2 ≤ 3,5, where D1 is an outer diameter of the body part, D2 is an outer diameter of the coupling part, D3 is an inner diameter of the body part, D4 is an outer diameter of the balance weight part, E1 is a Young's modulus of the shaft part, and E2 is a Young's modulus of the balance weight part. D1 is an outer diameter of the body part, D2 is an outer diameter of the coupling part, D3 is an inner diameter of the body part, D4 is an outer diameter of the balance weight part, E1 is a Young's modulus of the shaft part, and E2 is a Young's modulus of the balance weight part.