NOVELTY - A fuel cell apparatus, comprises: a reformer (200) for generating an anode gas including hydrogen by reforming a fuel gas by way of water vapor generated at an evaporating portion (210); a combusting portion (300) forming a combusting space (301) in which combustion flame heating the reformer (200) is generated; a stack (400) supplied with the anode gas and a cathode gas to generate electric power; a heat insulating wall (500); and a fixing portion (600) arranged along the heat insulating wall (500).    USE - A fuel cell apparatus (claimed).    ADVANTAGE - The fuel cell apparatus absorbs a thermal expansion occurring at a reformer that is heated to a high temperature in association with a power generation operation, and which contributes to enhancement of durability and a longer life of the reformer.    DETAILED DESCRIPTION - A fuel cell apparatus, comprises: a reformer (200) for generating an anode gas including hydrogen by reforming a fuel gas by way of water vapor generated at an evaporating portion (210), the reformer (200) being arranged to extend in a lengthwise direction; a combusting portion (300) forming a combusting space (301) in which combustion flame heating the reformer (200) is generated; a stack (400) supplied with the anode gas and a cathode gas to generate electric power; a heat insulating wall (500) surrounding the reformer (200) and the stack (400); and a fixing portion (600) arranged along the heat insulating wall (500), where a first end portion (200e) of the reformer (200) in the lengthwise direction is fixed to a part (601) of the fixing portion (600) at a welded portion (701, 702, 704, 705) or by way of a fixture so that a displacement of the first end portion (200e) which occurs in association with a thermal expansion of the reformer (200) in the lengthwise direction is restrained, and a second end portion (200f) of the reformer (200) in the lengthwise direction is placed at a placement surface (802, 802E, 802F) of the heat insulating wall (500) in a manner that the second end portion (200f) is relatively displaceable in the lengthwise direction of the reformer (200) in association with the thermal expansion.    DESCRIPTION OF DRAWING(S) - The drawing shows a vertical cross-sectional view of an internal configuration of a fuel cell apparatus.    Reformer (200)    Evaporating portion (210)    Combusting portion (300)    Combusting space (301)    Stack (400)    Heat insulating wall (500)    Fixing portion (600)