A radar device comprising: an oscillator that generates an oscillation signal having a predetermined frequency; a first switch (111, 311) that switches the oscillation signal like a pulse; a second switch (112, 312) that further switches the signal switched by the first switch (111, 311) to generate a high-frequency pulse signal; an antenna (101,102) that receives the RF pulse signal from the second switch (112, 312) as an input, radiates the RF pulse signal to space as a radio wave, and receives a reflected wave obtained when the radio wave is reflected by an object; a down-converting unit that receives the received signal from the antenna as an input and down-converts the received signal to a baseband signal; a noise-signal processing unit (140, 240, 340, 440) that receives the baseband signal from the down-converting unit as an input and outputs a low-noise baseband signal in which a noise signal is reduced; and an object-information computing unit that receives the low-noise baseband signal from the noise-signal processing unit (140, 240, 340, 440) as an input and computes a distance to the object and/or a relative speed of the object, and/or an azimuthal angle of the object; wherein the radar device is configured such that the first switch (111, 311) and the second switch (112, 312) become an on-state approximately at the same time to generate the RF pulse signal, and either one of the first switch (111, 311) and the second switch (112, 312) independently becomes the on-state to obtain the noise signal; and the noise-signal processing unit (140, 240, 340, 440) delays the noise signal obtained when either one of the first switch (111, 311) and the second switch (112, 312) independently becomes the on-state and delays the received baseband signal by mutually different time delays, substracts the noise signal from the baseband signal to remove the noise signal from the received baseband signal, and outputs the low-noise baseband signal. an oscillator that generates an oscillation signal having a predetermined frequency; a first switch (111, 311) that switches the oscillation signal like a pulse; a second switch (112, 312) that further switches the signal switched by the first switch (111, 311) to generate a high-frequency pulse signal; an antenna (101,102) that receives the RF pulse signal from the second switch (112, 312) as an input, radiates the RF pulse signal to space as a radio wave, and receives a reflected wave obtained when the radio wave is reflected by an object; a down-converting unit that receives the received signal from the antenna as an input and down-converts the received signal to a baseband signal; a noise-signal processing unit (140, 240, 340, 440) that receives the baseband signal from the down-converting unit as an input and outputs a low-noise baseband signal in which a noise signal is reduced; and an object-information computing unit that receives the low-noise baseband signal from the noise-signal processing unit (140, 240, 340, 440) as an input and computes a distance to the object and/or a relative speed of the object, and/or an azimuthal angle of the object; wherein the radar device is configured such that the first switch (111, 311) and the second switch (112, 312) become an on-state approximately at the same time to generate the RF pulse signal, and either one of the first switch (111, 311) and the second switch (112, 312) independently becomes the on-state to obtain the noise signal; and the noise-signal processing unit (140, 240, 340, 440) delays the noise signal obtained when either one of the first switch (111, 311) and the second switch (112, 312) independently becomes the on-state and delays the received baseband signal by mutually different time delays, substracts the noise signal from the baseband signal to remove the noise signal from the received baseband signal, and outputs the low-noise baseband signal.