A lower vessel of an RH degasser which can more effectively suppress the floating of a refractory which constitutes a center part of a bottom is provided by the following configuration. A bottom part refractory 3 includes a center part refractory 3B, an arrangement refractory 3C which is arranged contiguously with the center part refractory 3B, and a connection refractory 3D which is arranged at a position where at least a portion of the connection refractory 3D overlaps with a vertically downward projection view of a side wall refractory 5. The connection refractory 3D which is contiguously arranged with the arrangement refractory 3C is constituted of two or more force transmission refractories 3Da arranged in the direction toward the arrangement refractory 3C from the side-wall refractory 5. Opposedly facing surfaces between the force transmission refractories 3Da at least at a position among the force transmission refractories 3Da are inclined such that upper portions of the opposedly facing surfaces are positioned on a more inner side of a bottom portion than lower portions of the opposedly facing surfaces are positioned.
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