A convoy travel apparatus transmits convoy travel information including a whole convoy ID and a sub-convoy ID when a subject vehicle is in a convoy travel state, and performs a convoy travel control by utilizing the sub-convoy ID. Further, a second vehicle of the whole convoy is a leader vehicle of a sub-convoy and is also a follower vehicle in a forward sub-convoy, thereby (i) determining the convoy travel control of itself by receiving the convoy travel information of the sub-convoy in which the subject vehicle is traveling as the follower vehicle and (ii) transmitting the convoy travel information including the content of the determined convoy travel control. Thus, the follower vehicle in the sub-convoy lead by the subject vehicle performs the convoy travel control based on the convoy travel information from the leader vehicle of the sub-convoy in which the subject vehicle is traveling as the follower vehicle.