The present invention discloses a device for regenerating a sheet-like recording medium comprising a means for feeding a printed sheet-like recording medium, a regenerating treatment means having a step for eliminating image formed on said recording medium, a means for discriminating and separating the recording medium whether the treated recording medium is reusable or not and a means for storing the separated reusable recording medium.Further, the present invention discloses, as Examples, regenerating treatment means treating sheet-like recording media printed with following toners or inks with following degrading agent or a color eliminating agent;(i) a toner comprising biodegradable plastics as a constituent ingredient and an enzyme containing liquid as a degrading agent;(ii) a toner comprising photodegradable plastics as a constituent ingredient and an irradiation of a light containing a short wavelength light;(iii) a toner or an ink using a coloring material comprising an electron-donating color-forming organic compound and its developer and a color-eliminating agent; and(iv) a toner or an ink using a coloring material comprising an electron-accepting color-forming organic compound and its developer and a color-eliminating agent.