PROBLEM TO BE SOLVED: To provide an effective sterilizing means for a door knob of a temporary washroom, and an effective deodorizing means in a box.SOLUTION: A sterilizing/deodorizing apparatus 24 is installed in the hollow interior of a door panel 4 of hollow double walls made of a plastic blow molding. The sterilizing/deodorizing apparatus 24 includes an ozone generator, a ventilation path for leading ozone generated in the ozone generator to the inside and outside of a washroom box, and a fan for delivering the ozone generated in the ozone generator, through the ventilation path. The ventilation path is connected to a release opening 15 opened to the vicinity of the door knob 14, and the ozone is released toward the door knob 14 from the release opening 15.
