A supporter fastening to a hub axle of bicycle for supporting a fender or light is disclosed. The supporter includes a mount, two clipping pieces, a bolt and a connecting rod. The mount has a fixing hole for being penetrated by the hub axle and a first long hole for being penetrated by a screw to fasten to a rear fork end of the bicycle. The two clipping pieces are separately located on two opposite sides of the mount. The bolt is formed with a ring and a threaded rod. The bolt penetrates through the clipping pieces and the mount to fasten. One end of the connecting rod penetrates through and is fastened in the ring. The connecting rod is capable of being rotated at a desired angle by axially rotating the bolt.