A radar apparatus comprising: a transmitting unit that generates a probe wave including a continuous wave; an antenna unit including a transmission antenna that radiates the probe wave to a space and a reception antenna that receives a reflected wave from a target of the probe wave; a receiving unit that outputs a signal obtained by down-converting a reception signal from the reception antenna into a predetermined frequency band; and a signal processing unit that applies a predetermined frequency analysis to the signal output from the receiving unit and outputs information concerning one or more of a distance to the target, a relative speed to the target, and a direction in which the target is present, wherein when a detection area of the target is classified into a first detection area and a second detection area, the first detection area being an area at a distance closer than a distance set in advance and at an angle wider than an angle set in advance, and the second detection area being an area at a distance farther than the set distance and on an inner side of the set angle, the reception antenna includes a plurality of antennas for reception as array antennas and, in the reception antenna, a reception first array that probes the first detection area using a predetermined number of antennas adjacent to one another among the plurality of antennas for reception and a reception second array that probes the second detection area using all the antennas are configured, the transmission antenna is shared as an antenna for probe of the first and second detection areas, and the radar apparatus is characterized in that second null of a radiation pattern by the transmission antenna and first null of a reception pattern by the reception second array are substantially matched such that these nulls are at least outside the angular ranges of the second detection area, and first null of the radiation pattern of the transmission antenna is filled to set a level difference between a first side lobe of the radiation pattern of the transmission antenna and first null of the radiation pattern of the transmission antenna within a predetermined value. a transmitting unit that generates a probe wave including a continuous wave; an antenna unit including a transmission antenna that radiates the probe wave to a space and a reception antenna that receives a reflected wave from a target of the probe wave; a receiving unit that outputs a signal obtained by down-converting a reception signal from the reception antenna into a predetermined frequency band; and a signal processing unit that applies a predetermined frequency analysis to the signal output from the receiving unit and outputs information concerning one or more of a distance to the target, a relative speed to the target, and a direction in which the target is present, wherein when a detection area of the target is classified into a first detection area and a second detection area, the first detection area being an area at a distance closer than a distance set in advance and at an angle wider than an angle set in advance, and the second detection area being an area at a distance farther than the set distance and on an inner side of the set angle, the reception antenna includes a plurality of antennas for reception as array antennas and, in the reception antenna, a reception first array that probes the first detection area using a predetermined number of antennas adjacent to one another among the plurality of antennas for reception and a reception second array that probes the second detection area using all the antennas are configured, the transmission antenna is shared as an antenna for probe of the first and second detection areas, and the radar apparatus is characterized in that second null of a radiation pattern by the transmission antenna and first null of a reception pattern by the reception second array are substantially matched such that these nulls are at least outside the angular ranges of the second detection area, and first null of the radiation pattern of the transmission antenna is filled to set a level difference between a first side lobe of the radiation pattern of the transmission antenna and first null of the radiation pattern of the transmission antenna within a predetermined value.