To provide a scroll compressor capable of securing proper belt tension without using a tension pulley.

In a scroll compressor 4 provided with crank parts 17a, 18a connected to one side or another side of a radial direction outer circumference part of turning scroll member 14, a main crank shaft 17 and a auxiliary crank shaft 18 rocking the turning scroll member 14, and provided with timing belt pulleys 19A, 19B provided on shaft end parts 17b, 18b of the main crank shaft 17 and the auxiliary crank shaft 18 and a timing belt 20 mounted on the timing belt pulleys 19A, 19B and synchronously turning the main crank shaft 17 and the auxiliary crank shaft 18, the timing belt 20 has a plurality of tooth parts 28 formed in an arc shape in an inner circumference side and the timing belt pulleys 19A, 19B have a plurality of groove parts 29 formed in a arc shape.