Abstract: Provided are a microwave range, which uniformly radiates microwaves from an upper part of a cooking chamber in order to cook food, and a radiation module thereof. The microwave range includes a cooking chamber, a magnetron that radiates microwaves through an antenna, and a radiation module including a waveguide that introduces the microwaves into an upper part of a rectangular upper surface of a cooking chamber from the antenna and provides a propagation path along which the introduced microwaves are horizontally guided along sides of the upper part of the upper surface of the cooking chamber, and radiating the microwaves to the cooking chamber through two or more paired slot antennas formed on a bottom surface of the waveguide.