A master gear shaft of a spinning reel has a through-hole having a rectangular
cross-section formed on the inner periphery of the master gear shaft. A handle
shaft has a head that interlocks with the right end of the master gear shaft, a
trunk which extends from the head and is non-rotatively inserted into the through-hole,
and a first threaded portion having a male screw projecting from the tip of the
trunk. A handle arm has a boss for interlocking with the left end of the master
gear shaft, a second threaded portion, which is a female screw threaded portion
that engages with the first threaded portion and is provided on the boss, and an
arm that extends from the boss in a direction interlocking with the master gear
shaft. The handle assembly prevents a handle shaft from loosening from a master
gear shaft in a spinning reel.
