Disclosed are a scroll compressor having a frame fixing structure and a frame fixing method of the scroll compressor. The scroll compressor comprises an upper frame installed at an inner upper portion of a hermetic container; a fixed scroll fixed to an upper portion of the upper frame; and an orbiting scroll orbitably installed between the fixed scroll and the upper frame, wherein a joining groove is formed at a lateral surface of the upper frame, a curved portion having a penetration hole is formed at a lateral surface of the hermetic container corresponding to the joining groove, and a welding portion fixes the hermetic container and the upper frame through the penetration hole.