To optimize the reinforcement of the whole fire door when a smoke insulating rubber is provided throughout the lateral direction of the fire door which is equipped with a guide rail.

The fire door includes an internal component means, a front-side surface plate component means, a backside surface plate component means, first-fourth reinforcing plate component means, a guide groove means, and an insulating member means. The guide groove means is formed throughout the lateral surface of the fire door so as to guide a shutter curtain. The insulating member means is provided throughout the downside of the fire door, including the guide groove means. The constitution like this enables the optimization of the reinforcement of the whole fire door when the smoke insulating rubber is provided throughout the lateral direction of the fire door which is quipped with the guide groove means (guide rail).

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