To prevent crackings which are easily generated in an original paper during molding by a method wherein both sides are extended and molded in the crossing directions by using notches of a piece of paper as a reference by compression.

A flexible cover sheet 18 is laid on the bottom mold 17 and the first piece of paper 14 provided with a number of notches 12 is placed on the cover sheet 18 and in addition, the second piece of paper 14 is laminated on the first piece of paper 14 and in this case, they are arranged in such a way that the directions of notches 12 of both pieces of papers 14 are mutually in the crossing direction at right angles. In addition, another flexible cover sheet 18 is placed on these two pieces of papers 14 and a top mold 13 is lowered toward the bottom mold 17 and they are compressed to mold a cushioning material for packaging. In addition, before molding the second piece of paper 14, the piece of paper 14 is extended to both sides by using the notch 12 as a boundary line and is molded to make moldability of the piece of paper 14 furthermore sure.