To prevent pattern from becoming unnatural, and also prevent forgery effectively.

In a forgery prevention printed matter to be printed in use of at least one kind of ink or more, aluminum flakes as scale powder are mixed in one or more kind of ink, and if the ink 103, 111 mixed with the aluminum flakes is dark color ink 111, the dark color ink is mixed with aluminum flakes of 2 wt.% or more, and if it is bright color ink 103, the bright color ink is mixed with aluminum flakes of 2-20 wt.%.