The present invention provides a vehicle communication system by which even when the number of other vehicles around a traffic line is increased, it is possible to prevent occurrence of a situation that there are located vehicles the number of which is larger than the capacity of a communicable network, and it is possible to secure communications with the other vehicles. Even when it is determined that a host vehicle enters in a traffic line and a plurality of other vehicles the number of which is larger than a threshold value are located in front and rear virtual regions of the host vehicle, a transmission power is reduced to the extent that communications between the host vehicle and one of the other vehicles that is located furthest in the virtual regions can be secured.