The invention relates to a radiant tube type heating facility, which comprises a heat exchanger. The heat exchanger is arranged in the hollow part of the other end of a radiant tube. The heat exchanger utilizes the heat of exhaust gas to preheat the air for combustion. The heat exchanger comprises a ceramic body, which has a cylindrical shape; an annular edge, which is arranged on the end of the heat exchanger; a flowing path for heat dissipation of exhaust gas, which is spirally formed along the external surface of the body; a flowing path for absorbing heat of the air for combustion, which is spirally formed in the body; and a flow back path for preheated air for combustion, which is axially formed in the center of the body. The annular flange is clamped between mutually opposite pairs of pipe ends via a relatively thick pair of annular fillers located on the other end side of the radiant tube and has a flexible and thermally insulating tubular body with a heat exchanger. The openingportion on the base end side of the return flow path is continuously and coaxially provided.