To provide a communication system between vehicles by which more detailed information between vehicles can be provided to a driver.

This system is provided with a memory part 4 for recording information, a communication circuit part 2 for communicating recorded contents in the memory part 4 with the other vehicle through an antenna part 1 by radio, a signal processing/control part 3 for performing arithmetic processing of acquired information and an on-vehicle millimeter radar part 6 for acquiring information on a position relation with the other vehicle. In the signal processing/control part 3, by successively performing arithmetic processing of a presence/ absence N of a preceding vehicle or distance (d) between vehicles acquired from the on-vehicle millimeter radar part 6 or memory part 4 on the preceding vehicle and recording the arithmetic result in the memory part 4 of the present vehicle, the recorded information in that memory part 4 is displayed out on a display part 5, more detailed information between vehicles can be provided to the driver and irritation or the like during driving can be relaxed.