To add simply and inexpensively a back cover part for raising easily identification properties on a twofold printed matter, or a thin printed matter with a binding part on a twofold central line.

The thin printed matter is characterized by having a back cover displaying on a part of a paper face constituting a back surface cover on the twofold printed matter with a thickness between the surface cover and the back surface cover under a bookbinding condition of ≥5 mm on average. The thin printed matter described in the claim 1 is characterized by that as a paper used for the surface cover and the back surface cover, a thick cardboard is used, and a line-containing processing is applied on the boundary line part between the back cover displaying part and the back surface cover part.