PURPOSE: To provide a concealing postcard having a simple structure and low manufacturing cost by folding two sheets double to adhere and integrate the same by an adhesive and concealing mentioned items by a concealing means.

CONSTITUTION: A paper postcard main body 1 is formed by adhering three peripheral edges of both sheet pieces 3a, 3b opposed to each other folded double along a folding part 2 through an adhesive 4 to integrate the same. A postal code number column 5 or a display column 6 of separate payment of postage instead of by affixed postage stampls are formed to the outer surface of the sheet piece 3a to form the outer surface of the sheet piece 3a as a display surface for displaying an address and the company name 11 of a sender or color printing for propaganda/advertisement is displayed on the outer surface of the sheet piece 3b. Further, the inner surface of the sheet piece 3a is printed black and mentioned items as a communication sentence are printed on the inner surface of the sheet piece 3b. Therefore, the communication sentence is perfectly concealed by both sheet pieces 3a, 3b and the mentioned items is held to a perfectly secret state during mailing.