Optical element, article having label attached thereon, optical kit and discriminating method

摘要

Increased is the variety of changes of an image in accordance with observation conditions displayed on an optical device including a solidified liquid crystal material. An optical device (10) includes a layered structure including a recess-forming layer (13) with light-transmitting property, a main surface of which includes one or more recess-forming regions each provided with first grooves equal in longitudinal directions to one another and adjacent to one another in a direction crossing the longitudinal directions, and a liquid crystal layer (15) supported by the main surface and made of a solidified liquid crystal material, and a reflection layer (12) facing the layered structure.