PURPOSE: To protect definitely an arbitrary number of skis from theft by simple operation.

CONSTITUTION: A clamp 42 is fixedly mounted to one end of a wire rope 41 to which uneven parts 41a are installed where the clamp 42 is designed to clamp an arbitrary intermediate part of the wire rope, thereby forming a loop. A fitting means 46b, which fits in the uneven parts 41a installed on the surface of the wire rope is installed to a wire rope clamping surface of the clamp 42 with the wire rope 41 in a closed state. A lock 45, which inhibits an unlocking operation in a closed state, is installed to the clamp 42. The clamp 42 may be installed to both ends of the wire rope respectively.