Spinning reel

A spinning reel comprising:

• a reel unit including a reel body configured to be mounted on a fishing rod, a first opening on a side surface of the reel body, and a first lid member configured to cover the first opening;
• a rotation transmission mechanism including a master gear shaft arranged along a direction of a first shaft axis extending in a lateral direction and rotatably mounted to the reel body and the first lid member, a master gear arranged on the master gear shaft and rotatably disposed about the first shaft axis, and a pinion gear arranged along a direction of a second shaft axis extending in a longitudinal direction and configured to mesh with a plurality of gear teeth of the master gear;
• a handle assembly rotatably coupled to the master gear shaft;
• a rotor rotatably mounted to the reel body about the second shaft axis, the rotation of the handle assembly being transmitted via the rotation transmission mechanism to the rotor;
• a spool shaft movable relative to the reel body in the direction of the second shaft axis;
• an oscillating mechanism configured to move the spool shaft back and forth in cooperation with the rotation of the handle assembly;
• and
• a spool mounted to a fore end of the spool shaft, and configured for fishing line to be wound around an outer peripheral surface of the spool by the rotation of the rotor,
• the reel body including a first rotation support portion that rotatably supports the master gear shaft on a master gear side of the spool shaft, and
• the first lid member including a second rotation support portion that rotatably supports the master gear shaft on a first lid member side of the master gear.