A hermetic compressor accommodating in a hermetic container (101; 501) an electric motor element (102; 502) and a compression element (103; 503) driven by the electric motor element (102; 502), wherein the compression element (103; 503) comprises: a crankshaft (110; 310; 510) including a main shaft (115; 515), an eccentric shaft (114; 514), and a flange (116; 516), a spiral groove (117a; 321a) being formed in a cylindrical surface (115a; 515a) of the main shaft (115; 515); a cylinder block (111; 511) having a cylinder bore (123; 525) passing through the cylinder block (111; 511) in a cylindrical shape; a piston (112; 512) configured to reciprocate in the cylinder bore (123; 525); a connecting rod (113; 513) connecting the piston (112; 512) and the eccentric shaft (114;514); and a bearing (124; 526) formed on the cylinder block (111; 511), for pivotally supporting a radial load that acts on the main shaft (115; 515) of the crankshaft (110; 310; 510), characterised in that: the crankshaft (110; 310; 510) further comprises: a communicating oil supply passage (118; 317; 522) in the flange (116; 516); a main shaft oil supply passage (119; 520) communicating between the communicating oil supply passage (118; 317; 522) and the cylindrical surface (115a; 515a) of the main shaft (115; 515); and an eccentric shaft oil supply passage (120; 521) communicating between the communicating oil supply passage (118; 317; 522) and a cylindrical surface (114a; 514a) of the eccentric shaft (114; 514), wherein the main shaft oil supply passage (119; 520) and the eccentric shaft oil supply passage (120; 521) are independent passages, and wherein the main shaft oil supply passage (119; 520) is configured to guide oil from the spiral groove (117a; 321a) in the cylindrical surface (115a; 515a) of the main shaft (115; 515) to the communicating oil supply passage (118; 317; 522) in the flange (116; 516). a crankshaft (110; 310; 510) including a main shaft (115; 515), an eccentric shaft (114; 514), and a flange (116; 516), a spiral groove (117a; 321a) being formed in a cylindrical surface (115a; 515a) of the main shaft (115; 515); a cylinder block (111; 511) having a cylinder bore (123; 525) passing through the cylinder block (111; 511) in a cylindrical shape; a piston (112; 512) configured to reciprocate in the cylinder bore (123; 525); a connecting rod (113; 513) connecting the piston (112; 512) and the eccentric shaft (114;514); and a bearing (124; 526) formed on the cylinder block (111; 511), for pivotally supporting a radial load that acts on the main shaft (115; 515) of the crankshaft (110; 310; 510), characterised in that: the crankshaft (110; 310; 510) further comprises: a communicating oil supply passage (118; 317; 522) in the flange (116; 516); a main shaft oil supply passage (119; 520) communicating between the communicating oil supply passage (118; 317; 522) and the cylindrical surface (115a; 515a) of the main shaft (115; 515); and an eccentric shaft oil supply passage (120; 521) communicating between the communicating oil supply passage (118; 317; 522) and a cylindrical surface (114a; 514a) of the eccentric shaft (114; 514), a communicating oil supply passage (118; 317; 522) in the flange (116; 516); a main shaft oil supply passage (119; 520) communicating between the communicating oil supply passage (118; 317; 522) and the cylindrical surface (115a; 515a) of the main shaft (115; 515); and an eccentric shaft oil supply passage (120; 521) communicating between the communicating oil supply passage (118; 317; 522) and a cylindrical surface (114a; 514a) of the eccentric shaft (114; 514), wherein the main shaft oil supply passage (119; 520) and the eccentric shaft oil supply passage (120; 521) are independent passages, and wherein the main shaft oil supply passage (119; 520) is configured to guide oil from the spiral groove (117a; 321a) in the cylindrical surface (115a; 515a) of the main shaft (115; 515) to the communicating oil supply passage (118; 317; 522) in the flange (116; 516).