A microwave heating device comprising: a heating chamber that accommodates an object (21; 31) to be heated; a microwave generator that generates a microwave to be supplied to the heating chamber ; a waveguide (4; 40) through which the microwave generated by the microwave generator propagates to the heating chamber ; a radiation antenna that radiates the microwave propagating inside the waveguide (4; 40) to the heating chamber ; a rotary driver that rotates the radiation antenna ; a reflected wave detector that detects at least part of a reflected wave inside the waveguide (4; 40); a controller that controls a direction in which the radiation antenna faces by controlling driving of the rotary driver based on a reflected wave detection amount detected by the reflected wave detector , the controller controlling the rotary driver so as to stop the radiation antenna when the radiation antenna faces in a first direction in which the reflected wave detection amount is minimized and in a second direction different from the first direction in which the reflected wave detection amount is minimized; and an incident wave detector that detects an incident wave detection amount of at least part of an incident wave inside the waveguide (4; 40), characterized in that : from the incident wave detection amount and the reflected wave detection amount that are related to each of the plurality of directions in which the radiation antenna stops to face the first direction or the second direction, the controller calculates absorption amounts of the microwave absorbed by the object (21; 31), and controls the rotary driver so as to equalize products of the absorption amounts and stop times at respective stop locations. a heating chamber that accommodates an object (21; 31) to be heated; a microwave generator that generates a microwave to be supplied to the heating chamber ; a waveguide (4; 40) through which the microwave generated by the microwave generator propagates to the heating chamber ; a radiation antenna that radiates the microwave propagating inside the waveguide (4; 40) to the heating chamber ; a rotary driver that rotates the radiation antenna ; a reflected wave detector that detects at least part of a reflected wave inside the waveguide (4; 40); a controller that controls a direction in which the radiation antenna faces by controlling driving of the rotary driver based on a reflected wave detection amount detected by the reflected wave detector , the controller controlling the rotary driver so as to stop the radiation antenna when the radiation antenna faces in a first direction in which the reflected wave detection amount is minimized and in a second direction different from the first direction in which the reflected wave detection amount is minimized; and an incident wave detector that detects an incident wave detection amount of at least part of an incident wave inside the waveguide (4; 40), characterized in that : from the incident wave detection amount and the reflected wave detection amount that are related to each of the plurality of directions in which the radiation antenna stops to face the first direction or the second direction, the controller calculates absorption amounts of the microwave absorbed by the object (21; 31), and controls the rotary driver so as to equalize products of the absorption amounts and stop times at respective stop locations. <EOS>