An adhesive sheet applicable to a delivery slip and the like includes a first sheet having a first sheet base of which both surfaces are formed as printable surfaces; and a second sheet having a second sheet base of which one surface is formed as a printable surface, while the other surface is sequentially laminated with a pseudo-adhesive layer, and an adhesive layer, and the adhesive layer is formed as a printable surface of mirror letters. In the first sheet, a predetermined area of the printable surface is laminated with a release agent layer, and the release agent layer is overlapped with the adhesive layer so as to be opposing thereto. And then, by sticking the adhesive layer of the second sheet exposed outside the exterior edge of the first sheet to the adherend, the first sheet can be held with print letters concealed.