Provided are a heat treatment apparatus and a heat treatment method which can pour micro-powder to condensate gas without clamping a backflow prevention mechanical device and have good heating efficiency. The heat treatment apparatus (1) is provided with a supply mechanism (6) for supplying a powder body (10), a powder body poring part (7) poured into the powder body (10) by the supply mechanism (6), a non condensing gas supply part (20,23) blowing non condensing gas into the supply mechanism (6) or the powder body poring part (7), a condensing gas supply part (26) blowing condensing gas into the powder body (10) and non condensing gas mixture, and a heating part (8) for heating the powder body (10) through the condensing gas, wherein the powder body poring part (7) is configured to allow the powder body (10) mixing with the non condensing gas to flow towards the heating part (8) from top to bottom； the powder body (10) in the heating part (8) is poured into the airflow of pressurized condensing gas for heating processing.
