To provide a bookbinding method in which each document unit is freely attachable/detachable when bookbinding of a plurality of the document units comprising a plurality of documents is executed to a cover made of paper or a synthetic resin sheet and synthetic paper.

The cover is made of the paper or the synthetic resin sheet and the synthetic paper. A face fastener tape is superimposed to the inner face of the rear cover of the cover by an adhesive or by welding and ultrasonic waves or the like. Fabrics and nonwoven fabrics or the like, which have an attachment/detachment mechanism to/from the face fastener tape in a set of male and female forms with the face fastener tape superimposed to the cover or the face fastener tape superimposed to the cover by a raised-fluff-shaped structure, are cut in a tape. The cover, and the fabrics and the nonwoven fabrics or the like cut in a tape are bonded to a bound edge part of a document set composed of the plurality of documents. Plural copies of the document sets are mounted to the cover. As a result, the bookbinding method, in which each document unit is freely attachable and detachable, can be realized.