PURPOSE: To accurately judge information by providing more than specific number of seats approximately in the vertical direction to an information reading direction virtually with specific number of lines and appropriately arranging more than one pair of information display members on the seats of one line.

CONSTITUTION: By virtually providing more than five seats for more than one lines approximately in the vertical direction against the information reading direction on the surface of a base member and appropriately arranging more than one pair of information display members on the seats of one line, the combination of arrangement of a pair of information display member against a pattern of virtual seats becomes more than ten patterns and expressed by more than ten kinds of characters, and the reading of the corresponding information code can not be performed until a constant number of information display member is confirmed. Therefore, even when the base member is distorted and a constant number of information display member can not be confirmed simultaneously, the reading of the corresponding information code does not performed until the constant number of it is confirmed. Thus, the risk of erroneously reading the information indicating an information code can be prevented, and accurate judgement can be performed.