To constitute a folding fire door device so that it can be installed with proper workability.

In this folding fire door device 1, the first and second door bodies 2 and 3 are swingably connected together in the width direction of an opening. The door tail side of the first door body 2 is pivoted on the one side portion of the opening via a pivot 4; a door tail-side end of the second door body 3 is connected to the door end side of the first door body 2 via hinges 5 and 6; a screw 12b makes an auxiliary plate 12 as an adjusting member fixed via a slot 12a to a door end-side edge of the second door body 3, which is positioned on the door end side, so as to close a gap between the door end side edge of the second door body 3 and the opening.

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