PURPOSE: To enable a closet seat cover to be fitted on or removed from the rear side surface of the closet seat cover with one touch by fitting arresting boards there.

CONSTITUTION: The closet seat cover B of the same thin type as the type of the O-type or the U-type of a closet seat is manufactured, and on the rear side surface of the cover B, the the arresting boards A of small types are fitted at some positions. On the fitting method of the one-touch closet seat cover B, the closet seat has the same type as that of the closet seat cover B, and so, just by covering the seat with the cover, and just by pushing the sections of the arresting boards A softly, the fitting is completed. On removing the cover, it can be removed by pulling the sections of the arresting boards A slightly. In this manner, the fitting and removing can be performed with one touch, and so they are simplified and are clean. Besides, the cover can be used for any closet seat, with free size.