To provide a security device, its verifying method, and a printed matter advantageous in enhancing designability and forging-preventing effect.

An oriented layer 2 is formed on a base material 1, an image forming layer 3 comprising a liquid crystal molecule is formed on the same, and a scattering reflecting layer 4 is formed on the same. A grid-like pattern a plurality of grids parallel each other formed with recessed portions (grooves) and projecting portions is arranged in the oriented layer 2. The image forming layer 3 is constituted of at least two areas with different film thicknesses. The liquid crystal molecule in the image forming layer 3 is oriented along the grooves of the grid-like pattern of the oriented layer 2 and fixed by polymerization. The liquid crystal molecule is oriented along the grooves of the grid-like pattern, thereby the liquid crystal molecule can be visually recognized when observing via a polarizing film. Phase difference given to the transmitting light changes when the film thickness changes due to the double diffraction of the liquid crystal, so that different colors are observed according to the film thicknesses when observing via the polarizing film.

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