Abstract: A spinning reel spool for more conveniently for locking and unlocking the mid-part of fishing line is provided. The spinning-reel spool has a spool body and a large-diameter tubular skirt. The spool body includes on an outer circumference a tubular bobbin trunk onto which fishing line is wound. The larger-diameter tubular skirt is formed integrally with the bobbin trunk on its rear. A fishing-line lock is provided on the outer periphery of the skirt. The fishing-line lock locks fishing-line. The locked fishing line is released under tension acting over a line roller when the fishing line is reeled out. The fishing-line lock includes a lock portion provided outwardly exposed and facing out on the skirt outer periphery, and a mount portion that extends into the skirt interior. The lock portion is configured to be approximately hemispherical or tetra-spherical in contour.