A scroll compressor comprising: a scroll compression mechanism ; a housing having a cylindrical shape, inside which the scroll compression mechanism is mounted; a drive shaft ; a bearing member ; a crank pin that is provided at an end of the drive shaft , said end being rotatably supported by the bearing member ; an orbiting scroll that is joined with the crank pin via a drive bush so that the orbiting scroll can be driven in a revolving orbital manner, and a balance weight (33A; 33B) that is provided on the drive bush by means of shrink fitting, wherein l/d ≥ 0.25 and D/d ≥ 1.4 are satisfied, assuming that, in a shrink fitted portion, an axial-direction length of a fitting portion (35A; 35B) of the balance weight (33A; 33B) to be shrink fitted to the drive bush is l, that an inner diameter of the fitting portion (35A; 35B) is d, and that an outer diameter of the fitting portion (35A; 35B) is D, and the balance weight (33A; 33B) is provided with a weight portion (36A; 36B; 36C) in an arc-shape at an outer circumferential portion of the fitting portion (35A; 35B) to be shrink fitted to the drive bush , and the weight portion (36A; 36B; 36C) has a shape that is extended in an axial direction from both surfaces of the fitting portion , characterized in that the bearing member includes a journal bearing portion that supports the drive shaft in a freely rotatable manner, is securely installed inside the housing , and is provided with a concave portion that receives the weight portion that is extended from a surface of the fitting portion (35A; 35B) of the balance weight (33A; 33B) away from the orbiting scroll. a scroll compression mechanism ; a housing having a cylindrical shape, inside which the scroll compression mechanism is mounted; a drive shaft ; a bearing member ; a crank pin that is provided at an end of the drive shaft , said end being rotatably supported by the bearing member ; an orbiting scroll that is joined with the crank pin via a drive bush so that the orbiting scroll can be driven in a revolving orbital manner, and a balance weight (33A; 33B) that is provided on the drive bush by means of shrink fitting, wherein l/d ≥ 0.25 and D/d ≥ 1.4 are satisfied, assuming that, in a shrink fitted portion, an axial-direction length of a fitting portion (35A; 35B) of the balance weight (33A; 33B) to be shrink fitted to the drive bush is l, that an inner diameter of the fitting portion (35A; 35B) is d, and that an outer diameter of the fitting portion (35A; 35B) is D, and the balance weight (33A; 33B) is provided with a weight portion (36A; 36B; 36C) in an arc-shape at an outer circumferential portion of the fitting portion (35A; 35B) to be shrink fitted to the drive bush , and the weight portion (36A; 36B; 36C) has a shape that is extended in an axial direction from both surfaces of the fitting portion , characterized in that the bearing member includes a journal bearing portion that supports the drive shaft in a freely rotatable manner, is securely installed inside the housing , and is provided with a concave portion that receives the weight portion that is extended from a surface of the fitting portion (35A; 35B) of the balance weight (33A; 33B) away from the orbiting scroll. <EOS>