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PROBLEM TO BE SOLVED : combustion efficiency of a fossil fuel in a boiler or the like is remarkably improved to improve energy efficiency, and can contribute to global environmental protection and to provide a device for improving combustion efficiency of a fossil fuel. SOLUTION : boiler piping 2 provided at both ends with a connecting port 1b of the casing 1a and at least one end side of the piston along the inner circumferential surface of the pair of magnets 3a, 3b so as to face the fixed. Furthermore, in the casing 1a, the clay is added to the pulverized tourmaline ore into a predetermined shape and formed of a first ceramic fired, pulverized clay and rare earth ore torr man ore of predetermined shape and formed of a second ceramic firing, carries a predetermined charge ratio. Selected drawing : fig. 1