To provide an architectural decoration and a manufacturing method therefor for easily installing and carrying the architectural decoration by weight reduction, eliminating the occurrence of a crack by improving flexibility and strength and enabling installation by nailing.

In this architectural decoration 1c, a foaming powder containing composition is used as a first raw material, a composition composed of the following composition is used as a second raw material, a filler is set to 75 to 85 wt.%, an aqueous acrylic binder is set to 15 to 20 wt.%, an aqueous dispersant is set to 4 to 8 wt.%, water is a residual part, and an aqueous slurry or pasty third composition 7 obtained by kneading by mixing the second raw material at a rate of 5 to 60 wt.% with the first raw material is applied to glass fiber meshes 3 stuck to a surface of a prescribed-shaped base 2 composed of a foaming material.