To easily fold up and knock down a fold-up type container according to the kind and quantity of a content to be stored, and to facilitate the storage and the transport by folding a portion for a side wall of a sheet at a folding groove, overlapping end parts of the portions for the side wall adjacent to each other, and fitting projections to receiving holes to form the side wall.

A portion C for side wall is folded at a folding groove D to fold up a fold-up type container E out of a sheet A for manufacturing a container. Then, end parts of the portion C for side wall adjacent to each other across notches C1 overlap on each other to fit projections C2 provided on the overlapped part to receiving holes C3. The fold-up type container E having a side wall G with the portion C for side wall inclined to a portion B for bottom wall is assembled thereby. When a plurality of projections C2 and receiving holes C3 are provided, the inclination of the side wall G with respect to a bottom wall F and the depth, i.e., the capacity of the fold-up type container E can be changed if the projections C2 are fitted to the receiving holes C3 by changing the combination thereof according to the kind and the number of the content.