A microwave heating device comprising: a heating chamber adapted to house an object to be heated; a microwave generation portion adapted to generate a microwave; a waveguide portion adapted to propagate the microwave; and a plurality of microwave radiating portions (102, 601) which are provided to the waveguide portion and are adapted to radiate the microwave to the inside of the heating chamber; characterized in that: each of the microwave radiating portions is adapted to radiate a circular polarization as the microwave to the inside of the heating chamber, each of the microwave radiating portions having an opening formed on a surface of the waveguide portion, through which the circular polarization of the microwave is radiated from the waveguide portion into the inside of the heating chamber, the plurality of microwave radiating portions are arranged in tandem toward a direction orthogonal to a direction of electric field and to a direction of propagation within the waveguide portion, and the plurality of microwave radiating portions are arranged to have an interval between each other in the direction orthogonal to the direction of electric field and to the direction of propagation on the waveguide portion and also in the direction of propagation of the electric field, and the centers of at least two microwave radiating portions are arranged at positions corresponding to approximate node positions of the electric field of a standing wave which arises within the waveguide portion, wherein the centers of the microwave radiating portions refer to the center position of the opening for radiating the microwaves. a heating chamber adapted to house an object to be heated; a microwave generation portion adapted to generate a microwave; a waveguide portion adapted to propagate the microwave; and a plurality of microwave radiating portions (102, 601) which are provided to the waveguide portion and are adapted to radiate the microwave to the inside of the heating chamber; characterized in that: each of the microwave radiating portions is adapted to radiate a circular polarization as the microwave to the inside of the heating chamber, each of the microwave radiating portions having an opening formed on a surface of the waveguide portion, through which the circular polarization of the microwave is radiated from the waveguide portion into the inside of the heating chamber, the plurality of microwave radiating portions are arranged in tandem toward a direction orthogonal to a direction of electric field and to a direction of propagation within the waveguide portion, and the plurality of microwave radiating portions are arranged to have an interval between each other in the direction orthogonal to the direction of electric field and to the direction of propagation on the waveguide portion and also in the direction of propagation of the electric field, and the centers of at least two microwave radiating portions are arranged at positions corresponding to approximate node positions of the electric field of a standing wave which arises within the waveguide portion, wherein the centers of the microwave radiating portions refer to the center position of the opening for radiating the microwaves. each of the microwave radiating portions is adapted to radiate a circular polarization as the microwave to the inside of the heating chamber, each of the microwave radiating portions having an opening formed on a surface of the waveguide portion, through which the circular polarization of the microwave is radiated from the waveguide portion into the inside of the heating chamber, the plurality of microwave radiating portions are arranged in tandem toward a direction orthogonal to a direction of electric field and to a direction of propagation within the waveguide portion, and the plurality of microwave radiating portions are arranged to have an interval between each other in the direction orthogonal to the direction of electric field and to the direction of propagation on the waveguide portion and also in the direction of propagation of the electric field, and the centers of at least two microwave radiating portions are arranged at positions corresponding to approximate node positions of the electric field of a standing wave which arises within the waveguide portion, wherein the centers of the microwave radiating portions refer to the center position of the opening for radiating the microwaves.