Abstract: A postal card having a cover sheet releasably bonded to the printed surface of a card substrate, comprising a card substrate on which secret contents are printed, a transparent protection film made of a thermoplastic resin bonded by means of adhesive layer to the printed surface of the card substrate, a cover sheet applied with a lamination film made of a thermoplastic resin different from the thermoplastic resin for the protection film, and a coupling layer made of the same kind of the thermoplastic resin as that for the lamination film and supplied between the protection film and the lamination film while heated to a temperature within a range from the softening point to the melting point of the resin for releasably coupling the protection film and the lamination film, in which the protection film, the coupling layer and the lamination film are firmly secured with each other at a fixing area and a releasing area is formed at another portion of the outer peripheral region.