In a microwave heating device of the present disclosure, inverter unit drives first and second microwave generators. Cooling unit cools first and second microwave generators and inverter unit. First and second waveguides supplies, to cavity, microwaves generated by first and second microwave generators. First and second microwave generators are disposed side by side in a right-left direction below a bottom surface of cavity. Inverter unit and cooling fan are disposed from the first and second microwave generators toward a front side in order, and first and second waveguides are provided so as to extend in a front-back direction from first and second microwave generators, respectively. According to the present disclosure, the microwave heating device can be further downsized in a right-left direction.