In order to provide the disclosed compact microwave heating device that has a high heating efficiency and a more compact microwave electricity supply configuration disposed above a heating chamber, a waveguide tube that transmits microwaves from a microwave generation unit has a vertical transmission pathway and a horizontal transmission pathway that are bent perpendicularly, is configured in a manner such that the microwave generation unit is connected horizontally to the vertical transmission pathway and the microwaves from the microwave generation unit are transmitted to an electricity supply unit via the vertical transmission pathway and the horizontal transmission pathway, and is configured in a manner such that the horizontal transmission distance in the horizontal transmission pathway is longer than 1/2 the wavelength of the microwaves transmitted within the waveguide tube.
