A radar apparatus of the present invention includes: an antenna member including first-type and second-type horns different in distance from base portions to apertures of the horns; a feed unit including a plurality of waveguides each having one end connected to the respective base portions of the first-type horns and second-type horns; a radio frequency circuit; an information-processing circuit; and a signal line. In addition, the waveguides connected to the respective base portions of the first-type horns are open on different receiving ends on the radio frequency circuit at the other end of each waveguide, whereas the waveguides connected to the respective base portions of the second-type horns are open on transmitting ends on the radio frequency circuit at the other end of each waveguide. Yet additionally, at least part of the feed unit is positioned more forward than the base portions of the second-type horns. Consequently, it is possible to downsize the radar apparatus.