To provide a laminator capable of separating a material to be treated or a film from a roller to certainly prevent the involution thereof to properly keep the involution preventing function thereof.

The laminator 10 has a pair of rollers 14A and 14B, which are used for bonding the heated film to an article to be treated under pressure, in mutually opposed relationship. A wire 20 is spanned over the respective rollers 14A and 14B through grooves 14b to forcibly separate the film, which is press-bonded to the article to be treated fed by a roller 14, from the peripheral surface of the roller 14 to be prevented from involution. The wire 20 is fixed at one end thereof and the other end thereof is wound around the shaft 22 to be supported and the displacement of the roller 14 in a rotary axial direction is permitted. Further, a plurality of the wires 20 are arranged independently so as not to mutually interfere with each other.