A solid oxide fuel cell device comprising: a fuel cell container including a power generation chamber therein, the fuel cell container being for maintaining a gas-tightness of a fuel gas and/or an air; a plurality of fuel cell stacks (6; 26) being held in the power generation chamber of the fuel cell container (21; and a stack current collector by which the fuel cell stacks (6; 26) are coupled to each other in the fuel cell container; each of the fuel cell stacks (6; 26) comprising: a plurality of cylindrical fuel cells (1; 32), and a conductive member for electrically connecting the fuel cells (1; 32), wherein each of the fuel cells (1; 32) comprises a fuel electrode and an air electrode; and a holding member (8, 9, 10) surrounding the fuel cell stack (6; 26); the holding member (8, 9) includes a fuel electrode side holding member (8; 12) which is electrically coupled to the fuel electrode of at least one of the fuel cells (1; 32), and an air electrode side holding member which is electrically coupled to the air electrode of at least one of the other fuel cells (1; 32), a side surface holding member coupling the fuel electrode side holding member (8; 12) and the air electrode side holding member, wherein the holding member further comprises an insulating portion (13, 14) which electrically insulates at least one of the fuel electrode side holding member (8; 12) and the air electrode side holding member from the side surface holding member, wherein the fuel electrode side holding member (8; 12) and the air electrode side holding member in each of the fuel cell stacks (6; 26) are respectively fixed so as to press the fuel cells (1; 32) in an electrically serial direction of the fuel cells (1; 32), and wherein the fuel cell stacks (6; 26) are electrically connected to each other by the fuel electrode side holding member (8; 12) and/or the air electrode side holding member. a fuel cell container including a power generation chamber therein, the fuel cell container being for maintaining a gas-tightness of a fuel gas and/or an air; a plurality of fuel cell stacks (6; 26) being held in the power generation chamber of the fuel cell container (21; and a stack current collector by which the fuel cell stacks (6; 26) are coupled to each other in the fuel cell container; each of the fuel cell stacks (6; 26) comprising: a plurality of cylindrical fuel cells (1; 32), and a conductive member for electrically connecting the fuel cells (1; 32), wherein each of the fuel cells (1; 32) comprises a fuel electrode and an air electrode; and a holding member (8, 9, 10) surrounding the fuel cell stack (6; 26); the holding member (8, 9) includes a fuel electrode side holding member (8; 12) which is electrically coupled to the fuel electrode of at least one of the fuel cells (1; 32), and an air electrode side holding member which is electrically coupled to the air electrode of at least one of the other fuel cells (1; 32), a side surface holding member coupling the fuel electrode side holding member (8; 12) and the air electrode side holding member, wherein the holding member further comprises an insulating portion (13, 14) which electrically insulates at least one of the fuel electrode side holding member (8; 12) and the air electrode side holding member from the side surface holding member, wherein the fuel electrode side holding member (8; 12) and the air electrode side holding member in each of the fuel cell stacks (6; 26) are respectively fixed so as to press the fuel cells (1; 32) in an electrically serial direction of the fuel cells (1; 32), and wherein the fuel cell stacks (6; 26) are electrically connected to each other by the fuel electrode side holding member (8; 12) and/or the air electrode side holding member. a plurality of cylindrical fuel cells (1; 32), and a conductive member for electrically connecting the fuel cells (1; 32), wherein each of the fuel cells (1; 32) comprises a fuel electrode and an air electrode; and a holding member (8, 9, 10) surrounding the fuel cell stack (6; 26); the holding member (8, 9) includes a fuel electrode side holding member (8; 12) which is electrically coupled to the fuel electrode of at least one of the fuel cells (1; 32), and an air electrode side holding member which is electrically coupled to the air electrode of at least one of the other fuel cells (1; 32), a side surface holding member coupling the fuel electrode side holding member (8; 12) and the air electrode side holding member, wherein the holding member further comprises an insulating portion (13, 14) which electrically insulates at least one of the fuel electrode side holding member (8; 12) and the air electrode side holding member from the side surface holding member, wherein the fuel electrode side holding member (8; 12) and the air electrode side holding member in each of the fuel cell stacks (6; 26) are respectively fixed so as to press the fuel cells (1; 32) in an electrically serial direction of the fuel cells (1; 32), and wherein the fuel cell stacks (6; 26) are electrically connected to each other by the fuel electrode side holding member (8; 12) and/or the air electrode side holding member.