PURPOSE: A reinforcement coupler is provided to heighten bonding power when coupling reinforcing bars. CONSTITUTION: The reinforcement coupler comprises: a pair of fitting pieces(3); a housing(8) formed on both sides to control the fitting pieces(3); a screw part for fitting right and left housings(8) mutually; a screw(4') formed on an outer side of the housing(8); a locker nut formed on the outer side of the housing(8) to control the screw part; a fixing groove(7) formed on an inner side(2) of the fitting pieces(3) to press a joint(15) formed on the outside of a reinforcing bar(5); and a taper nut part(4') formed on an outer side of the fitting pieces(3) and coupled by a taper nut part(4') formed on an inner side of the housing(8).
