To provide a steam generation apparatus for reforming an original fuel that stabilizes the production of steam.

The steam generation apparatus for reforming the original fuel is equipped with an evaporation chamber 2 installed at one side of a heat transfer plate 40 in thin flat form to the thickness direction of the heat transfer plate 40, which discharges a water to be supplied by evaporation, and a heating chamber 11 installed at the other side of the heat transfer plate 40, which heats the evaporation chamber 2 by allowing a heating fluid to flow therethrough. The steam generation apparatus is characterized in that the size of the thickness direction in the evaporation chamber 2 is set so that the bumping of the water in the evaporation chamber 2 is controlled and a filler F is filled in the evaporation chamber 2.

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