To smoothly cut a mold hooking part without being disturbed by a concrete wall surface by swinging an operation rod in a vertical direction and cutting the mold hooking part in the state of fitting a fitting groove to the mold hooking part projected from the concrete wall surface.

The fitting groove 1 is cut in a slit shape from one end face of a tool body 2 to a center part, and when it is fitted to the mold hooking part c2 projected from the concrete wall surface 6 and the operation rod 3 is swung back and forth, the mold hooking part c2 of a separator (c) for a mold is vertically and repeatedly bent at the part of a cutting groove c3 and the mold hooking part c2 is separated from a separator body c1. Also, since a notched part 4 is provided on the outer peripheral part of the tool body 2, a large swing angle of the operation rod 3 is attained without being disturbed by the concrete wall surface 6. Thus, the efficiency of the cutting work of the mold hooking part c2 is improved.