To provide an on-vehicle device for suppressing sudden starting of one's own vehicle, in a facility such as a parking area.

When determining that the own vehicle enters the facility from an own vehicle position detected by an own vehicle position detecting part 11 and a map data storage part 12, a navigation device 1 indicates so as to limit the upper limit of a fuel injection quantity to a predetermined quantity being a quantity of a degree of not suddenly starting the own vehicle, to an engine control device 3. The engine control device 3 of receiving indication sets the upper limit of the fuel injection quantity to the predetermined quantity. A distance up to a road from the own vehicle becomes a predetermined distance or less, and when a signal of indicating the performance of flashing of a direction indicator 4 is transmitted to the navigation device 1 from a vehicle body control device 2, the navigation device 1 releases a limitation of the fuel injection quantity.