An inertial (mass) body is relatively rotatably provided on a V gear. Further, a ring is provided at the outer peripheral side of the V gear so as to be rotatable and displacable in the rotational radial direction of the V gear. When the V gear is suddenly rotated with a spool, the mass relatively pivots to the side opposite to the side of the pull out direction, and displaces to the outside in the rotational radial direction of the V gear. By doing so, an inner peripheral portion of the ring contacts with an outer peripheral portion of the V gear, and the ring rotates with the V gear. Due to this a pressing portion provided at an outer peripheral portion of the ring displaces an interlocking pawl, meshing the interlocking pawl with ratchet teeth on an outer peripheral portion of the V gear.