To effectively prevent spread of a fire from an opening part of a fireproof compartment wall provided in a boundary of rooms when carrying products through two rooms in a production plant of foods and the like.

This fireproof compartment apparatus 1 comprises the fireproof compartment wall 2; the opening part 5 provided in a part of the fireproof compartment wall and communicating between the adjoining rooms; fillers 7 and 8 stored in a vessel mounted in the upper part of the opening part in one side of the fireproof compartment wall; a receiving member 9 disposed in the lower position of the opening part for receiving the fillers when being dropped; and trigger members 10, 11 and 15 opening the lid of the vessel by heat and dropping the fillers.