To provide a vehicle control device, a vehicle, a vehicle control program, and a vehicle control method that can deal with disconnection of vehicle-to-vehicle communication while receiving file data by improving communication efficiency while suppressing the tightness of the remaining memory.SOLUTION: A vehicle control device 10 includes a communication control unit 21 that performs vehicle-to-vehicle communication, a data reception processing unit 22 that receives file data transmitted from a communication destination vehicle 100 by vehicle-to-vehicle communication and saves the file data in a memory 30, and an unreceived file data management unit 23 that sets at least one of the upper limit of a period for storing partial data of the file data stored in the memory 30 in the memory 30 and the priority for deleting the partial data from the storage unit 30 according to the situation of a predetermined parameter when the vehicle-to-vehicle communication is disconnected after the reception of the file data by the data reception processing unit 22 is started and before the reception of the file data is completed.SELECTED DRAWING: Figure 2