To provide a changeable good-looking decorative panel by making the bright expression of a decorative pattern formed on a light transmitting substrate in an optional color possible by using light in a visible domain.

The decorative pattern 12 set on the back 11b opposite to the front 11a which is the light incidence side of the substrate 11 is formed by a reflection surface 121 in an irregular three-dimensional shape formed on the basis of a chaos theory formula. Light incident on the substrate 11 is reflected totally, or part of the incident light is reflected to transmit the residual part. Irregularly changing light and darkness are made to occur in the luminance of reflecting light to add the decorative pattern 12 with the light and darkness of light.