Abstract: A decorative structure includes: a plurality of base materials extending in a first direction and provided in parallel with each other at predetermined intervals in a second direction intersecting the first direction; and a plurality of panel materials, each of the plurality of panel materials being attached to two base materials adjacent to each other in the second direction among the plurality of base materials. Each of the plurality of base materials includes a protrusion protruding in the second direction. Each of the plurality of panel materials includes a body including an outer edge portion having a square shape in a plan view, and four legs provided along four sides of the outer edge portion. The panel material is attached by inserting the protrusion of one of the two base materials through an insertion hole provided in one of the four legs.

Abstract: Disclosed is a refractory/heat insulating panel used in buildings and structures which must have a refractory performance. In the refractory/heat insulating panel (801), the mechanical strength and the fireproofing performance at the joint portions, which are weak portions in the panel, are increased by integrally forming inorganic boards (831) in the male and female joint portions (832, 836), filling a light-weight aggregate in the core material located at the male and female joint portions at a high density, or making the density of the core material at the joint portions higher than that at the center of the panel.