Abstract: A utility knife (A) having a blade (C) retractable into a handle (B) is provided with a clipper (1) for clipping a dull end segment (E) from the blade along a score line. (F). The clipper includes an insertion portion (2) which may be inserted into the knife handle when the clipper is not in use, a hanger portion (3) which permits the clipper and knife to be hung on a garment pocket, and a connecting portion (4) connecting the insertion portion and hanger portion. The connecting portion includes a slit (5) for receiving the end segment of the blade and a movable means (14) permitting pivoting of a cover member (8) relative to a body member (7). The clipper is characterized in that a storage space (6) communicates with the slit (5) for storing blade segments clipped from knife blades.