A fishing reel handle assembly has a handle shaft, handle knobs, first and second handle arms, and an arm attachment. The handle knobs are respectively rotatably attached to the attachment ends of the first and second handle arms. The arm attachment is configured to rotate integrally with the handle shaft. The arm attachment includes a first attachment portion that allows the base end of the first handle arm to be detachably attached to the first attachment portion. The first attachment portion prevents the base end of the first handle arm from rotating about a first axis. The second attachment portion allows the base end of the second handle arm to be detachably attached to the second attachment portion. The second attachment portion prevents the base end of the second handle arm from rotating about a second axis.
