To provide a door device provided with a smoke interruption member capable of being extremely easily fitted and adjusted in a construction site.

In a device provided with a smoke interruption member through a support member at the upper part of the door, a plurality of tap holes are formed in the support member (1). The smoke interruption member is installed through the support member at the upper part of the door, a stiffening plate is attached to a three-way frame, the smoke interruption member and the stiffening plate are constituted so as to oppose to each other. A hole for confirming the connected state of the smoke interruption member and the stiffening plate is formed (2). The smoke interruption member is attached to the upper part of the door through the support member. The three-way frame is provided with the stiffening plate, the smoke interruption plate and the stiffening plate are constituted to face each other in the device. A hole for confirming the connection state of the smoke interruption member and the stiffening plate is formed in the door. The stiffening plate is provided so as to be freely transferrable in the direction of the smoke interruption member (3).