A built-in transmitting and receiving integrated radar antenna (100, 200, 300, 900), comprising: a transmitting antenna (120, 220) disposed at one end side of one surface of a first dielectric substrate (20, 111, 211, 311); a receiving antenna (130, 230) disposed at another end side of one surface of the first dielectric substrate (20, 111,211,311); an EBG (Electromagnetic Band Gap) disposed between the transmitting (120, 220) and receiving antennas (130, 230); partition through-holes (163, 164, 263, 264) respectively disposed between the transmitting antenna (120, 220) and the EBG and between the receiving antenna (130, 230) and the EBG; a first ground plane (112, 212, 312) formed on another surface of the first dielectric substrate (20, 111, 211, 311); and a second dielectric substrate (22. 113, 213, 313) disposed on a surf ace on an opposite side from the first dielectric substrate (20, 111, 211, 311) across the first ground plane (112, 212, 312); characterized in that the first dielectric substrate (20, 111, 211, 311) is composed of at least three layers of a first layer, a second layer, and a third layer in order from the one surface side; a second ground plane (114, 214, 314) is provided further by being disposed so as to oppose to the EBG across the first layer so that the second ground plane (114, 214, 314) becomes a ground of the EBG; and the partition through-holes (163, 164, 263, 264) are conductively connected to the first (112, 212, 312) and second ground planes (114, 214, 314) by penetrating at least through the first, second and third layers of the first dielectric substrate (20, 111, 211, 311) and the second dielectric substrate (22. 113, 213, 313). a transmitting antenna (120, 220) disposed at one end side of one surface of a first dielectric substrate (20, 111, 211, 311); a receiving antenna (130, 230) disposed at another end side of one surface of the first dielectric substrate (20, 111,211,311); an EBG (Electromagnetic Band Gap) disposed between the transmitting (120, 220) and receiving antennas (130, 230); partition through-holes (163, 164, 263, 264) respectively disposed between the transmitting antenna (120, 220) and the EBG and between the receiving antenna (130, 230) and the EBG; a first ground plane (112, 212, 312) formed on another surface of the first dielectric substrate (20, 111, 211, 311); and a second dielectric substrate (22. 113, 213, 313) disposed on a surf ace on an opposite side from the first dielectric substrate (20, 111, 211, 311) across the first ground plane (112, 212, 312); characterized in that the first dielectric substrate (20, 111, 211, 311) is composed of at least three layers of a first layer, a second layer, and a third layer in order from the one surface side; a second ground plane (114, 214, 314) is provided further by being disposed so as to oppose to the EBG across the first layer so that the second ground plane (114, 214, 314) becomes a ground of the EBG; and the partition through-holes (163, 164, 263, 264) are conductively connected to the first (112, 212, 312) and second ground planes (114, 214, 314) by penetrating at least through the first, second and third layers of the first dielectric substrate (20, 111, 211, 311) and the second dielectric substrate (22. 113, 213, 313).