HANDLE ASSEMBLY FOR DUAL-BEARING REEL AND DUAL-BEARING REEL Abstract of the Disclosure A dual-bearing reel attachable to a fishing rod, comprising, a reel unit, a handle shaft rotatably supported by the reel unit, and a handle assembly being mounted onto the handle shaft. The handle assembly includes a handle arm and a handle knob rotatably attached to a tip of the first arm portion. The handle arm includes an attachment portion detachably attached onto the handle shaft in a unitarily rotatable state, a first arm portion extending radially outwards from the attachment portion, first and second protruding portions disposed around of the attachment portion, and a coupling portion. The first and second protruding portions are protruding radially outwards. The first and second protruding portions are circumferentially aligned at predetermined intervals. The coupling portion couple the protruding portions.