The present invention relates to a fireproof door, which comprises a fire-protection glass and a support means for supporting the fire-protection glass, and the support means comprising an elastic member in contact with both surfaces of an edge portion of the fire-protection glass, a reinforcing frame for supporting the elastic member, and a fixing plate fixed to a support and corresponding to both surfaces of the reinforcing frame. The fireproof door of the present invention has a grade A fireproof performance.