To collect a rental fee according to operation days or operation hours about a rented and used device, and to economically and easily find the operation days and hours.

This rental device has at least a use-disabling means 11 temporarily disabling the device, and a use-enabling means 12 making the temporarily-unusable device usable. The use-disabling means and the use-enabling means are controlled by a dedicated key inputted from an information input means 13 to control the operation of the device, and the rental fee according to the operation hours is found.