To provide a heat treatment machine and a heat treatment device capable of being installed in a small installation space, achieving the lowest possible manufacturing cost.

The bottom of a casing 10 at its corner on the reverse side is partitioned with an iron partition member 41 to form a tunnel-like combustion gas introduction chamber 40. At the upper part of the combustion gas introduction chamber 40, a plurality of iron cylindrical heating pipes 20, 20 each having a longitudinal size somewhat shorter than the horizontal size of the casing 10 are arranged a longitudinally predetermined-distance spaced apart. To the inner ends of connection pipes 21, 21 arranged on the other side face of the casing 10, supporting rings 24, 24 having inner diameters the same as the outer diameters of the heating pipes 20, 20 are connected and fixed coaxially with the center axes of the connection pipes 21, 21. The other ends of the heating pipes 20, 20 are loosely fitted into the supporting rings 24, 24, respectively.