To fold and compression adhere an envelope with copying available in the market, and enable a cutting off and unsealing operation to be done at the compression adhered portions by sealing in a manner being cut off and unsealed with the hand through the utilization of the compression adhered portions for perforations.

Each compression adhering part 2 is fixed at an upper plate 1 and lower plate 3 so that the teeth of upper and lower parts are engaged with each other when compressed. During use, folded paper is inserted between the upper plate 1 and lower plate 3 thereby to be pressurized for compression. Paper laid at the position of compressed parts 2 is integrated and weakened at its specific portions, and the weakened portions works in the place of perforations to cut off. In this manner, an envelope is folded and compressed by the use of copying paper available in the market thereby being cut off and unsealed at compressed portions, and by compression adhering a printed matter, e.g. one surface of a sheet of copying paper, confirmation work can be omitted for users with respect to a detailed statement of contents, and the like.