To provide a clean room wherein bacteria and mold can be prevented from adhering to walls, a floor, and a ceiling in a room, and hence cleanliness in the room can be prevented from being deteriorated, and further the room is cleaned again in a short time up to a specified level after reopening an operation without the need of a routine cleaning work.

A wall panel 2 of a clean room is constructed as a bacterium coating film 23 on the surface side of a metal layer 22 formed on the surface of a panel body 21, and the bacterium coating film 23 comprises a porous metal oxide coating film 24 formed on the surface side of the metal layer 22 with an anodizing, and an iodine compound 26 impregnated in fine holes 25 formed in the metal oxide coating film 24 with electrophoretic electrodeposition.