To provide a corrugated board sheet for manufacturing a box body which is made of a corrugated board and in which a core is exposed to the inside, capable of obtaining sufficient strength of a bottom part even in the assembly-type bottom part, and suppressing manufacturing costs, and to provide the box body obtained by the corrugated board sheet and a method of manufacturing the corrugated board sheet.

A corrugated board sheet 10 includes a liner 12, a core 14, and a liner 16. The liner 16 is formed so that its width is smaller than that of the liner 12. The core is exposed on one face of the corrugated board sheet. A region where the liner 16 is formed is double-faced corrugated board. A region where the core is exposed is a single-faced corrugated board. The direction of a side part of a region of the single-faced corrugated board in the liner 16 is perpendicular to a corrugation direction of the core.