A roasting device for vegetable bulk material, in particular coffee beans, comprises a roasting container for roasting said vegetable bulk material. The roasting container has connected therewith a gas heating furnace for supplying heated gases to the roasting container. Further, the roasting device comprises an exhaust gas purifier connected via a gas line with the roasting container. For purifying the exhaust gas, the exhaust gas purifier comprises an oxidation bed made up of porous heat-accumulating and heat-exchanging material. Further, a heating element for heating a middle region of the oxidation bed to an oxidation and/or self-decomposition temperature, and a flow reverser for reversing the direction of flow through the oxidation bed are provided in the exhaust gas purifier.