PROBLEM TO BE SOLVED: To provide means capable of easily taking care of claws of an experimental animal.SOLUTION: A floor material 20 placed on a placing part 15 of a cage 1 for breeding an experimental animal has a metal plate 21 constituted flatly, and a surface layer part 22 formed on the surface of the metal plate, and containing a resin material 22A and many particles 22B. In the floor material, the surface of the surface layer part has an irregular shape, because the particles are projected to the surface side of the surface layer part.SELECTED DRAWING: Figure 1