A spool (4) for preventing backlash includes a bobbin trunk (7a), a rear flange portion (18e), and a front flange portion (8). The front flange portion (8) includes a first protruding portion (117a) and a first oblique portion (117b) that protrudes upward and forward from a tip of the first protruding portion (117a). The rear flange portion (18e) includes a second protruding portion (18a) and a second oblique portion (18b) that protrudes upward and rearward from a tip of the second protruding portion (18a). A length (B) in the radial direction of the second protruding portion (18b) is approximately the same as a length (A) of the first protruding portion (117a).
