To provide a method which enables an individual to produce a case-bound book with a high texture and also a high strength with less work and expense.
The body of a book binding each page overlapped on other and its back side have markings printed thereon for positioning a core material of the cover to be pasted for recognition at a glance before pasting. The front side has one sheet but the back side has a folded sheet and a sheet connecting the body and the cover, being structured to enclose the core material which warps inward but does not easily warp outward so that when the papers stretch after absorbing the moisture from a moisture-containing adhesive used for bonding the core material, the cover, and the body, and later dry and shrink, a stronger pulling force on the inside the cover can be generated than on the outside thereof.