1. An image forming apparatus comprising: visible image forming means for forming a visible image on a recording material in a visible image forming area; supplying means provided with a containing portion for containing the recording material therein, and for supplying the recording material from said containing portion to said visible image forming area; conveying means for conveying the recording material from said visible image forming area to said containing portion; and executing means for executing a mode in which said supplying means supplies the recording material having a visible image formed thereon to said visible image forming area, said visible image forming means forms a visible image to superimpose it on the visible image formed on said recording material, and said conveying means conveys the recording material having the visible images formed thereon in superimposing relationship with each other to said containing portion.