The present invention provides a thread spool capable of taking up a filiform body and holding it without causing it to have a permanent curl. The thread spool (11) has a base plate (14), thread hitch sections (15, 16), and auxiliary plates (17, 18). The base plate (14) is made from a resin, paper, and other materials and is formed in a narrow rectangular shape. The base plate (14) is bent at a center section (21). The thread hitch sections (15, 16) are arranged at both ends of the base plate (14). The auxiliary plates (17, 18) are fixed to the thread hitch sections (15, 16) to form flanges. Ends of the auxiliary plates (17, 18) arefixed to the base plate (14).