To depict novel and chic design with natural wrinkles encrusted in a random manner, by which Japanese beauty and a fantastic atmosphere can be performed.

A plurality of sheets of surface paper 11 are stuck through a joint 12 by overlapping, and small and large wrinkles 16, which are depicted by projecting a plurality of portions separated from each other in curved lines, bent lines, and branched lines from a base wall surface 10, are provided in a region other than the joint 12 of the respective surface paper 11. Also at the joint 12, the wrinkle 16 is continued to the wrinkle 16, which extends from the one or both the surface papers 11 toward the joint 12, and the wrinkle 16, which is arranged to spread over the surface paper 11 on both sides with the joint 12 therebetween, while respectively maintaining the same depiction as each of those.