To provide a genuineness determining structure, of valuable printed matter, featuring that genuineness can be easily determined by using no special devices, reliability and safety can be enhanced by certainly avoiding a reproduction due to the forgery and fraudulent use of the valuable printed matter, equipment cost can be cut by requiring no expensive devices for genuineness determination and printing cost also can be reduced.

This genuineness determining structure includes a genuineness determination pattern printing part 3 with a large number of ultrafine letters 2 which are impossible to distinguish by naked eye, arranged in an orderly manner, in a small subdivision 11 occupying a part of the surface 10 of the valuable printed matter 1 in a strip of paper. In addition, the structure includes dot lens moldings 4 of a strip of paper for generating an enlarged stereoscopic view image based on the ultrafine letters 2 by drawing the moldings 4 near the genuineness determination pattern printing part 3 or superposing the former over the latter during confirming the genuineness.