Fuel cell apparatus

A fuel cell apparatus includes a housing (200) including a power generation chamber (203) and a closing member (201, 202), a stack (400), a cathode gas flow passage (500), and an exhaust gas flow passage (600), the housing includes a first U-shaped plate member (210) which includes a first upper surface opening portion (211) opening upwardly, two first side walls (212) and a first bottom wall (213), the housing includes a second U-shaped plate member (220) which includes a second upper surface opening portion (221) opening upwardly, two second side walls (222) and a second bottom wall (223), the housing is formed by layering the first and second U-shaped plate members with each other while a clearance being provided therebetween, and one of the cathode gas flow passage and the exhaust gas flow passage includes a side clearance flow passage (510, 610) and a bottom clearance flow passage (520, 620).