Abstract: A supporter for exercise of golf swing minimizes a gap between a state in which the supporter is mounted and a state in which the supporter is not mounted, and is highly effective for exercising golf swing. The supporter 1 comprises a block-like space retaining body 10 which is closely attached on both wrists or both front arms within a triangle formed by both shoulders and a grip during golf swing and also having hardness and elasticity or a buffering function enough to prevent deformation against a pressing force by the both wrists and the both front arms during addressing and swinging, and a band 20 provided on the retaining body 10 and enabling amounting of the retaining body 10 on either one of the both wrists or the both front arms.