To prevent separation of a cost-surface, and reduce the amount of use of a pigment by comprising of a surface layer material formed into an arbitrarily shaped surface material by the use of arbitrarily colored resin material consisting of coloring material and resin and a main body comprising noncolored material integrally charged in the inner portion thereof.

A main body 2 is charged into the inner portion of an arbitrarily shaped surface layer material 1 formed of arbitrarily colored resin material. For example, for coloring the surface layer material 1, arbitrarily colored fine powder is used such as a pigment, and then this is mixed and colored in thermoplastic synthetic resin for forming a surface layer material 1 being planar having a thickness of ten microns to millimeters, of arbitrarily uneven configurations. Material of the main body 2 is, e.g. a resin alone, or a mixture of aggregate as an extender of mineral substance or the like such as stone and sand blended with resin, or regenerated resin, and other concrete, asphalt, lumber, metal, and the like.