Abstract: At least one key body formed with tooth-like projections, and a grip section gripped in use are formed separately from each other. The key body is mounted to a hollow portion of the grip section so as to be extensible and retractable with respect thereto, by angular movement of sliding movement. In order to retain a plurality of key bodies compactly, the key bodies are mounted to a single grip section. Further, in order to prevent loss and burglary and to facilitate carrying, the grip section having the key bodies accommodated therein is detachably held in a key holder such as a bracelet, a buckle of a belt, or the like.