A spinning reel for forwardly releasing a fishing line, comprising: a reel body having a through-hole (10c, 10d) disposed in a rear portion thereof; a handle rotatably mounted to the reel body and configured to rotate so as to wind the fishing line; a spool shaft having a front end portion, being disposed on the reel body, and being configured to move in a longitudinal direction of the reel body; a spool disposed on the front end portion of the spool shaft, and being configured to have the fishing line wound on an outer periphery thereof; a rotor disposed on an outer peripheral side of the spool; a rotor driving mechanism configured to transfer rotation of the handle to the rotor and rotate the rotor in conjunction with the rotation of the handle; and an oscillating mechanism configured to rotate in conjunction with the handle and cause the spool to reciprocally move back and forth via the spool shaft, the oscillating mechanism comprising a threaded shaft having a spiral groove crossing an outer peripheral portion thereof and being configured to rotate in conjunction with the rotation of the handle, a slider connected to the spool shaft so as to enable the slider and the spool shaft to move as a unit in the axial direction, being engaged with the spiral groove of the threaded shaft, and being configured to reciprocate in conjunction with rotation of the threaded shaft, a guide shaft (23a, 23b) having a rear end disposed in the through-hole (10c, 10d) arranged in the rear portion of the reel body, and being locked so as to prevent the guide shaft (23a, 23b) from disconnecting from by the reel body, and being configured to guide the reciprocation of the slider, characterized in that an annular elastic member (45a, 45b, 145a, 145b) is disposed in between the through-hole (10c, 10d) and the guide shaft (23a, 23b). a reel body having a through-hole (10c, 10d) disposed in a rear portion thereof; a handle rotatably mounted to the reel body and configured to rotate so as to wind the fishing line; a spool shaft having a front end portion, being disposed on the reel body, and being configured to move in a longitudinal direction of the reel body; a spool disposed on the front end portion of the spool shaft, and being configured to have the fishing line wound on an outer periphery thereof; a rotor disposed on an outer peripheral side of the spool; a rotor driving mechanism configured to transfer rotation of the handle to the rotor and rotate the rotor in conjunction with the rotation of the handle; and an oscillating mechanism configured to rotate in conjunction with the handle and cause the spool to reciprocally move back and forth via the spool shaft, the oscillating mechanism comprising a threaded shaft having a spiral groove crossing an outer peripheral portion thereof and being configured to rotate in conjunction with the rotation of the handle, a slider connected to the spool shaft so as to enable the slider and the spool shaft to move as a unit in the axial direction, being engaged with the spiral groove of the threaded shaft, and being configured to reciprocate in conjunction with rotation of the threaded shaft, a guide shaft (23a, 23b) having a rear end disposed in the through-hole (10c, 10d) arranged in the rear portion of the reel body, and being locked so as to prevent the guide shaft (23a, 23b) from disconnecting from by the reel body, and being configured to guide the reciprocation of the slider, characterized in that an annular elastic member (45a, 45b, 145a, 145b) is disposed in between the through-hole (10c, 10d) and the guide shaft (23a, 23b).