To lighten a fire door, to improve handling properties at the time of the manufacture, transport and mounting of the fire door while enhancing even mechanical strength such as impact resistance, and to satisfy a fire- preventive level in a higher degree.

A fire-resisting layer 4 comprising a tabular molded form of expanded vermiculite is fitted into a frame body 3 forming the periphery of a square-shaped fire door A, and the surfaces of the fire-resisting layer 4 are covered with decorative sheets 5. The tabular molded forms of expanded vermiculite are superposed and formed on the surface and rear of the frame body 3 in one layer or more as the fire-resisting layers 4. Excellent heat-insulating properties and fire-resisting properties original in vermiculite are displayed, specific gravity is lowered, and the fire door is lightened.