To separate a paper substrate and a resin in a short time without increasing the environmental load when recycled paper is produced by using continuous laminated paper.

A method for separating the resin comprises a perforating step of forming a plurality of holes in the laminated paper 11 having a laminated structure composed of at least the paper substrate and the resin, a decompressing step of dipping the laminated paper 11 in a separation medium, placing the separation medium under vacuum for a prescribed time and then raising the pressure and a separating step of separating the paper substrate and the resin. In this case, since the laminated paper 11 is dipped in the separation medium which is then placed under vacuum for the prescribed time, air in interstices among the paper fibers is expanded and released from the plurality of holes, respectively. As a result, the separation medium is permeated through the holes into the interstices among the paper fibers, respectively. Thereby, the separation medium can be permeated through the paper substrate in the short time.