To provide a slip preventer for the hook of a clothes pole fixing hanger or the like, for avoiding such a situation in which washed articles hung on drying racks or hangers, etc., when forced by winds to slide along clothes poles, come close together so that they do not dry easily.

A freely expanding and contracting hook slip preventer 1 in the form of a spiral made of a resilient wire member to serve as a partition plate for the hook of a hanger or the like and a bellows-shaped clothes pole cover 6 located at each end and opened and closed by a lid 7 are easy to install on clothes poles.