Disclosed is a microwave irradiating and heating device including: a reaction furnace (1) for containing a sample material (50) to be irradiated with microwave and to be heated; a polarization grid (2) provided for the reaction furnace (1); a microwave irradiating source (3) for emitting a linearly polarized microwave, the microwave irradiating source (3) being disposed outside the reaction furnace (1); and a reflector (4) for reflecting the microwave emitted from the microwave irradiating source (3) toward the reaction furnace (1) through the polarization grid (2), the reflector (4) being disposed above the reaction furnace (1), wherein the microwave irradiating source (3) is arranged in such a way that the polarization direction of the reflected microwave which is made incident upon the polarization grid (2) is perpendicular to an orientation of the polarization grid (2).

Disclosed is a microwave irradiating and heating device including: a reaction furnace (1) for containing a sample material (50) to be irradiated with microwave and to be heated; a polarization grid (2) provided for the reaction furnace (1); a microwave irradiating source (3) for emitting a linearly polarized microwave, the microwave irradiating source (3) being disposed outside the reaction furnace (1); and a reflector (4) for reflecting the microwave emitted from the microwave irradiating source (3) toward the reaction furnace (1) through the polarization grid (2), the reflector (4) being disposed above the reaction furnace (1), wherein the microwave irradiating source (3) is arranged in such a way that the polarization direction of the reflected microwave which is made incident upon the polarization grid (2) is perpendicular to an orientation of the polarization grid (2).