To perform a favorable binding by a method wherein a non-porous material or a nearly non-porous material is arranged between a spine part and an adhesive.

The binding file consists of a front sheet 2, a rear sheet 3 and a back face part 4. The back face part 4 is made of porous or fairly highly porous material such as cardboard. In addition, as the back face part 4, a layer 5 made of synthetic material for applying a proper adhesive layer 6 thereon such as polyvinyl chloride. Thus, adhesive is prevented from penetrating in the porous material and no supplying of too thick adhesive layer 6 is necessary. The whole thickness of the adhesive can be utilized for binding sheets or the like.