A roasting burner comprising: a gas burner with a metal pipe having a screw hole; a tubular member attached to a tip of the metal pipe and having a hole portion through which a combustion flame thereof passes; and a support member for supporting the tubular member on the metal pipe, wherein the tubular member has a disc-shaped main body portion in which the hole portion is formed, and an insertion tubular portion erected in a cylindrical shape from a periphery of the main body portion, and wherein the insertion tubular portion is formed coaxially with the main body portion, and an outer diameter of the insertion tubular portion is substantially equal to an outer diameter of the main body portion, and the tip of the metal pipe is inserted into the insertion tubular portion, and wherein the support member includes: a U-shaped portion obtained by bending a rectangular plate-shaped sheet metal having a plate portion and a pair of opposed plate portions (41A, 41C) that are continuous with each end of the plate portion and face each other; a fixed plate portion that is continuous with one of the pair of opposed plate portions (41A, 41C) and is provided to face the plate portion and is fixed to the metal pipe; and a screw for fixing the plate portion to the metal pipe, and wherein the opposed plate portions (41A, 41C) extend in the radial direction of the tubular member, the plate portion extends in the axial direction of the tubular member, and the fixed plate portion extends in the axial direction of the tubular member and has a screw hole, and wherein the metal pipe, the tubular member, and the support member are formed in such a size that in a state where the screw is screwed into the screw hole of the metal pipe and into the screw hole of the fixed plate portion, a first gap is formed between the pair of opposed plate portions (41A, 41C) and the tubular member in an axial direction, a second gap is formed between the plate portion and the insertion tubular portion in a radial direction, a third gap is formed between the metal pipe and an inner peripheral surface of the insertion tubular portion in the radial direction, and a fourth gap is formed between a tip end of the metal pipe and a base end of the hole portion in the axial direction a gas burner with a metal pipe having a screw hole; a tubular member attached to a tip of the metal pipe and having a hole portion through which a combustion flame thereof passes; and a support member for supporting the tubular member on the metal pipe, wherein the tubular member has a disc-shaped main body portion in which the hole portion is formed, and an insertion tubular portion erected in a cylindrical shape from a periphery of the main body portion, and wherein the insertion tubular portion is formed coaxially with the main body portion, and an outer diameter of the insertion tubular portion is substantially equal to an outer diameter of the main body portion, and the tip of the metal pipe is inserted into the insertion tubular portion, and wherein the support member includes: a U-shaped portion obtained by bending a rectangular plate-shaped sheet metal having a plate portion and a pair of opposed plate portions (41A, 41C) that are continuous with each end of the plate portion and face each other; a fixed plate portion that is continuous with one of the pair of opposed plate portions (41A, 41C) and is provided to face the plate portion and is fixed to the metal pipe; and a screw for fixing the plate portion to the metal pipe, and wherein the opposed plate portions (41A, 41C) extend in the radial direction of the tubular member, the plate portion extends in the axial direction of the tubular member, and the fixed plate portion extends in the axial direction of the tubular member and has a screw hole, and a U-shaped portion obtained by bending a rectangular plate-shaped sheet metal having a plate portion and a pair of opposed plate portions (41A, 41C) that are continuous with each end of the plate portion and face each other; a fixed plate portion that is continuous with one of the pair of opposed plate portions (41A, 41C) and is provided to face the plate portion and is fixed to the metal pipe; and a screw for fixing the plate portion to the metal pipe, and wherein the opposed plate portions (41A, 41C) extend in the radial direction of the tubular member, the plate portion extends in the axial direction of the tubular member, and the fixed plate portion extends in the axial direction of the tubular member and has a screw hole, and wherein the metal pipe, the tubular member, and the support member are formed in such a size that in a state where the screw is screwed into the screw hole of the metal pipe and into the screw hole of the fixed plate portion, a first gap is formed between the pair of opposed plate portions (41A, 41C) and the tubular member in an axial direction, a second gap is formed between the plate portion and the insertion tubular portion in a radial direction, a third gap is formed between the metal pipe and an inner peripheral surface of the insertion tubular portion in the radial direction, and a fourth gap is formed between a tip end of the metal pipe and a base end of the hole portion in the axial direction