With an object of notifying a peripheral vehicle or a person of a travel plan of an own vehicle at an appropriate timing, and providing a safe automatic driving system, a travel plan information distribution system is characterized by including a travel plan information compilation unit that, based on information output by a positional information and frontal road shape information acquisition unit and a sensor information acquisition unit, compiles travel plan information including a travel plan category and a time at which travel is to be started or a position from which a travel plan is to be started, a wireless communication device that transmits travel plan information to a peripheral vehicle, and a travel plan information distribution control unit that selects and outputs necessary details of travel plan information at a safe and necessary timing.