| 摘要 |
PROBLEM TO BE SOLVED: To provide a double postcard which conforms to a postal law and can be mailed legally at a charge of the double postcard and which increases greatly the amount of transmittable information in comparison with a usual one. SOLUTION: A postcard sheet S1 constituted of five leaves joined in continuity or a postcard sheet S2 of six leaves joined in continuity is folded so that the leaves are joined by the third leaf 3 on the side of a card for requesting a reply and the fourth leaf 4 on the side of a reply card (the leaves to be the main-body cards respectively), and further the opposite surfaces of the leaves are integrated with each other peelably by a pseudo-adhesion means G.
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