An object of this invention is to provide a fishing line spool which is capable of securely holding a fishing line wound around the fishing line spool and reduced in cost.The fishing line spool is provided with a hollow core, a pair of flanges, and doors which are formed integrally. The doors are provided on outer peripheries of the flanges. The doors change postures between a closed posture in which tips of the doors are brought into contact to each other and an open posture in which the tips depart from each other. Each of the doors is formed from an elastic disc. Each of the doors is so curved that the tips of the doors press against each other in the closed posture. A pinching plate for pinching a fishing line is provided on the tip of each of the doors. The hollow core, the flanges, and the doors are made from a biodegradable resin.