Scroll compressor comprises a fixed scroll and the orbiting scroll. The compression chamber is formed by combining a rocking scroll spiral of the fixed scroll spiral and orbiting scroll of the fixed scroll. Sub discharge port of the fixed scroll, out of the compression chamber, inward of the outward surface and the orbit scroll spiral of the first compression chamber and the fixed scroll spiral that is partitioned by outwardly facing surface of the inwardly facing surface and the orbit scroll spiral of the fixed scroll spiral It is communicated between one and the discharge side of the second compression chamber being defined by the surface. Opening of the compression chamber side of the sub-discharge ports extend in a circumferential direction of the spiral shape, and a pair of side portions consisting of an involute curve extending in the radial direction of the spiral shape, a pair of connection that connects the pair of side and a section, the length in the circumferential direction of the spiral shape of the pair of side portions are formed longer than the length in the radial direction of the spiral shape of the pair of connecting portions, and any phase during one rotation of the orbiting scroll in also so as not to communicate with the first compression chamber and a second compression chamber is formed.