On the occasion of producing an image display apparatus, in order to suppress the bend and breakage of a substrate by uniformly heating the substrate which constructs a chamber which contains the image display apparatus, a plurality of heaters are located in opposition to both sides of the substrate in a vacuum chamber, which are further surrounded by a heat reflecting member, a partitioning member is located between end faces of the substrate and the heat reflecting member, and the substrate is heated.

 
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