A channel type bracket structure is provided to steadily set up the accessory unit in the elasticity fixing piece by preventing the generation of gap between the binding rail and the base bracket. The first holder(12) and the second holder(14) are formed in the rear side of a base bracket(10). The first and the second holder hang on both ends holder of the binding rail. An accommodating groove(16) is formed in the adjacent location with the second holder. An elasticity fixing piece(20) is combined with the accommodating groove of the base bracket. The first holder of the base bracket hangs on the holder of the base bracket. The second holder of the base bracket hangs on the other end holder of the binding rail.
