Cell stack device, module, and module housing device

A cell stack device comprising:

• a cell stack comprising a plurality of cells, each of the plurality of cells having a columnar shape and internally comprising a gas flow passage, the plurality of cells being vertically arranged and electrically connected;
• a manifold configured to fix lower ends of the plurality of cells and supply a reaction gas into the gas flow passages of the plurality of cells;
• and
• a reaction gas supply pipe connected to the manifold and configured to supply the reaction gas to the manifold,
• wherein
• the manifold and the reaction gas supply pipe are made of metal;
• the manifold comprises:
• an insertion portion configured to connect the reaction gas supply pipe to the manifold,
• a gap between the insertion portion and the reaction gas supply pipe, and
• a first joining portion configured to seal one end of the gap as a result of joining the insertion portion and the reaction gas supply pipe;
• in an arbitrarily defined cross-section along an insertion direction of the reaction gas supply pipe, the first joining portion has a meniscus shape;
• and
• a joint length, in the insertion direction, between the first joining portion and the reaction gas supply pipe is longer than a thickness of the reaction gas supply pipe.