Abstract: The present invention provides a petroleum polymer product treatment apparatus capable of reducing the thermal energy, which is required to heat the material to be treated, to the smallest possible quantity, effectively utilizing the residue obtained, keeping the heating temperature distribution uniform and setting the heating temperature to a predetermined level, and facilitating this kind of treatment operation while maintaining the safety of a petroleum reduction reproducing operation.This apparatus is provided with a thermal decomposition unit 50 having a heating furnace 1, an indirect heating means 3 installed in the interior of the heating furnace 1, and a sealed container 4 removably set in the indirect heating means 3; and a residue combustion unit 60 having a combustion furnace 20 adapted to hold the residue 27 left over in the sealed container 4 and burn the same, a means 23 for supplying the air to the combustion furnace 20, and an ignition means 24 for igniting an ignition material 25.