To provide a multi-stage type heating apparatus with which a plurality of metal plates can simultaneously be heated and also, the heated metal plate can individually be taken out and a strict management of the heating temperature can be performed and also, the high temperature heating of the metal plate can be used and further, the setting area of the apparatus can comparatively be made to small.

The main body 10 of the multi-stage heating apparatus has the heating chamber heated with the heat source in the inner part. In the front side wall 12 of the apparatus main body, the opening hole parts 18 at the plurality of stages are vertically arranged, and at each opening hole part 18 in each stage, a door 23 for opening/closing this opening hole part is arranged. At the door 23 in each stage, door movable supporting mechanisms (21,22) for supporting the door so as to be horizontally shiftable in the front and rear direction of the apparatus main body, are arranged at the outside of both side walls 14,15 at right and left sides. In the inside of the door 23 in each stage, a supporting tool (for example, a plurality of supporting bars 24) for supporting the metal plate as the heating object, is horizontally supported.