A handle grip for a fishing reel, and a handle assembly of a fishing reel are provided to prevent the source material of a cover part from flowing into a handle when the cover parts is molded. A handle grip for a fishing reel comprises a mounting unit(90) which can be pivotally mounted to the outer circumference of a handle shaft(18)； a first aperture(92a) which is installed at the mounting part and is formed at the terminal part separated from the mounting part； a first hollow handle which has a first engagement part(92b) formed to be concave at the edge part of the outer circumference of the first aperture； a second aperture(93a) which is arranged so as to face the first aperture of a first handle(92)； a second hollow handle which has a second engagement part(93b) formed to be concave at the edge part of the inner circumference of the second aperture and can be engaged to the outer circumference of the first engagement part； and a cover part which is made of an elastic material and covers the first handle and a second handle(93).
