The invention relates to a device for fastening the seat belt 17 of a motor vehicle driver 19. In the buckle 16, 20 of the belt 17 there is incorporated a contact 15 interposed on the ignition circuit 6, 7 of the engine. Thus, until he has correctly fastened his belt 17, the user 19 cannot start his vehicle. Application: automatically reminding the driver 19 that he has to fasten his belt 17. IMAGE
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