Seatbelt use-state warning device

The use state of the seatbelt is warned in the start-warning mode during the specified start-warning period of time after the starting of the power source of the vehicle. The warning by the warning device is disabled when the specified start-warning period of time has lapsed after the power source starting (step S15). The warning device to warn the use state of the seatbelt are enabled for the specified period of time (step S17 - S20) when the use state of the seatbelt detected by the seatbelt use-state detecting device changes during the operation of the vehicle power source (step S12). When the seatbelt is changed from its state of use to its state of non-use, the warning is conducted with the harder warning stimulation characteristic (steps S18, S19). Accordingly, there can be provided the seatbelt use-state warning device which can warn the driver properly.