A burner which is configured to perform self-induced oscillation and eject a combustion-supporting gas containing oxygen and a fuel gas from each of a plurality of fluid ejection outlets (2, 3, 4, 5) provided at the tip surface thereof, and to burn them, wherein the plurality of the fluid ejection outlets (2, 3, 4, 5) comprise a center fluid ejection outlet, a first peripheral fluid ejection outlet, a second peripheral fluid ejection outlet, and a third peripheral fluid ejection outlet; a pair of openings (62a, 62b) are provided at positions facing each other on side walls of a fluid ejection flow path on an upstream side of the center fluid ejection outlet; the pair of openings (62a, 62b) are communicated with each other through a communication pipe; a downstream side of the openings (62a, 62b) in the fluid ejection flow path has a cross-sectional shape in which an interval between the pair of side walls (63a, 63b) at which the openings (62a, 62b) are arranged gradually expands toward the downstream side; the first peripheral fluid ejection outlet is arranged around the center fluid ejection outlet; the second peripheral fluid ejection outlet is arranged at a position at which a distance between a center thereof and a center of the center fluid ejection outlet is larger than a distance between a center of the first peripheral fluid ejection outlet and the center of the center fluid ejection outlet, and in a direction orthogonal to an expanding direction of the center fluid ejection outlet; the third peripheral fluid ejection outlet is arranged at a position at which a distance between a center thereof and the center of the center fluid ejection outlet is larger than the distance between the center of the second peripheral fluid ejection outlet and the center of the center fluid ejection outlet, and in the direction orthogonal to the expanding direction of the center fluid ejection outlet; and the center fluid ejection outlet is configured to eject a center fluid D, the first peripheral fluid ejection outlet is configured to eject a peripheral fluid A, the second peripheral fluid ejection outlet is configured to eject a peripheral fluid B, and the third peripheral fluid ejection outlet is configured to eject a peripheral fluid C, wherein the peripheral fluid A is ejected so as to wrap the center fluid D, the peripheral fluid B and the peripheral fluid C are further ejected, and thereby the peripheral fluids A, B, and C are ejected toward the center fluid D in order. the plurality of the fluid ejection outlets (2, 3, 4, 5) comprise a center fluid ejection outlet, a first peripheral fluid ejection outlet, a second peripheral fluid ejection outlet, and a third peripheral fluid ejection outlet; a pair of openings (62a, 62b) are provided at positions facing each other on side walls of a fluid ejection flow path on an upstream side of the center fluid ejection outlet; the pair of openings (62a, 62b) are communicated with each other through a communication pipe; a downstream side of the openings (62a, 62b) in the fluid ejection flow path has a cross-sectional shape in which an interval between the pair of side walls (63a, 63b) at which the openings (62a, 62b) are arranged gradually expands toward the downstream side; the first peripheral fluid ejection outlet is arranged around the center fluid ejection outlet; the second peripheral fluid ejection outlet is arranged at a position at which a distance between a center thereof and a center of the center fluid ejection outlet is larger than a distance between a center of the first peripheral fluid ejection outlet and the center of the center fluid ejection outlet, and in a direction orthogonal to an expanding direction of the center fluid ejection outlet; the third peripheral fluid ejection outlet is arranged at a position at which a distance between a center thereof and the center of the center fluid ejection outlet is larger than the distance between the center of the second peripheral fluid ejection outlet and the center of the center fluid ejection outlet, and in the direction orthogonal to the expanding direction of the center fluid ejection outlet; and the center fluid ejection outlet is configured to eject a center fluid D, the first peripheral fluid ejection outlet is configured to eject a peripheral fluid A, the second peripheral fluid ejection outlet is configured to eject a peripheral fluid B, and the third peripheral fluid ejection outlet is configured to eject a peripheral fluid C, wherein the peripheral fluid A is ejected so as to wrap the center fluid D, the peripheral fluid B and the peripheral fluid C are further ejected, and thereby the peripheral fluids A, B, and C are ejected toward the center fluid D in order.