Disclosed herein is a solid oxide fuel cell. The solid oxide fuel cell 100 according to the present invention includes: a reforming support layer 110 formed in a tubular shape and reforming fuel supplied to the inside thereof; an anode 120 formed at the outer side of the reforming support layer 110; an electrolyte 130 formed at the outer side of the anode 120; and a cathode 140 formed at the outer side of the electrolyte 130. The solid oxide fuel cell 100 includes the reforming support layer 100, thereby making it possible to reduce the entire volume and weight of the fuel cell system without having a separate reformer.