To obtain a hydrogenation desulfurizer-integrated cylindrical steam reformer of a new structure in which a hydrogenation desulfurizer is integrally attached to a cylindrical steam reformer.

The cylindrical steam reformer includes: a plurality of cylindrical bodies consisting of a first cylindrical body, a second cylindrical body and a third cylindrical body arranged concentrically at intervals in the order of increasing diameter; a burner disposed at a central part in the radial direction of the first cylindrical body; a reforming catalyst layer packed with a reforming catalyst in a gap partitioned in the radial direction by the first cylindrical body and the second cylindrical body; and a CO conversion catalyst layer and a CO removal catalyst layer arranged in order in a gap between the second cylindrical body and the third cylindrical body in a position above the reforming catalyst layer, wherein the CO conversion catalyst layer is formed in a gap where a passage direction is inverted at one end in the axial direction with respect to the reforming catalyst layer. A heat insulator layer is disposed around the third cylindrical body at a part where the reforming catalyst layer is located in the cylindrical steam reformer, and the hydrogenation desulfurizer comprising a hydrogenation catalyst layer, a first adsorbent layer and a second adsorbent layer is disposed around the heat insulator layer.

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