Abstract: A voice instruction approval device includes: a change receiving unit that receives a change instruction given by voice; a presentation unit that presents information; an approval request instruction unit that gives the presentation unit a presentation instruction of an approval request requesting an approval operation for executing the change instruction; an approval operation receiving unit that receives the approval operation by an occupant; a presentation monitoring unit that monitors whether the presentation unit is in a state in which the approval request is able to be presented; a determination unit that determines to reject the change instruction when the presentation unit is in a state in which the approval request is not able to be presented; a re-operation instruction unit that gives the presentation unit a presentation instruction of a re-operation when the presentation unit cannot present the approval request.