The fuel cell casing includes a plural stacked units. Each unit includes a base body having a concavity, for accommodating a membrane electrode assembly; a first fluid channel formed in the base body; a first wiring conductor formed in the base body; a lid body for sealing concavity hermetically; a second fluid channel formed in the lid body; and a second wiring conductor formed in the lid body. The first wiring conductor of a lower unit is electrically connected to the second wiring conductor of an upper unit. Each unit has a convexity on an end portion of a side surface thereof which end portion is on an adjacent unit side, and the units adjacent to each other are bonded to each other at the convexities.