VEHICLE CONTROL DEVICE, PROGRAM UPDATE METHOD, AND COMPUTER-READABLE NON-TRANSITORY STORAGE MEDIUM STORING PROGRAM FOR PROGRAM UPDATE

The vehicle control device includes: a storage section including a first and a second storage areas in which a control program and an updated program which is an updated version of the control program are stored respectively; an execution section executing either of these programs; and an update section acquiring updated-portion data from an server, causing data of a post-update portion indicated by the updated-portion data and data of a portion, other than the update-target portion, of the control program stored in the first storage area to be stored as the updated program in the second storage area, and changing a program, to be executed by the execution section, to the updated program in a case of determining that the updated program is correctly stored, on the basis of a difference between the control program and the updated program stored in the first and second storage areas respectively.