A fuel cell system includes: a reformer configured to reform raw fuel to generate reformed gas; a solid-oxide fuel cell configured to generate electric power by a reaction between the reformed gas and air; a fuel collecting portion provided adjacent to the solid-oxide fuel cell, the reformed gas remaining after the reaction of the solid-oxide fuel cell being collected at the fuel collecting portion; an air flow-through portion formed along an outer periphery of the fuel collecting portion; a combustor configured to mix the reformed gas discharged from a fuel jetting opening of the fuel collecting portion with the air flowing through the air flow-through portion, to combust the reformed gas and configured to mix the reformed gas discharged from a fuel jetting opening of the fuel collecting portion with the air flowing through the air flow-through portion, to combust the reformed gas; and a covering body provided so as to block flow of the air in a direction from the air flow-through portion toward the combustor along the reformer, wherein: the reformer reforms the raw fuel using combustion heat of the combustor; and the covering body supplies the air toward the fuel jetting opening of the fuel collecting portion.