ON-BOARD POWER SUPPLY APPARATUS AND MANUFACTURING METHOD OF ON-BOARD POWER SUPPLY APPARATUS

An on-board power supply apparatus includes a common path, a plurality of branch paths (first branch paths), and cutoff portions (first cutoff portions) provided on the respective branch paths (first branch paths). The branch paths (first branch paths) each include an upstream conductor (first upstream conductor) and a downstream conductor (first downstream conductor). Each cutoff portion (first cutoff portion) is provided between the upstream conductor (first upstream conductor) and the downstream conductor (first downstream conductor), and is switched from a permitted state to a cutoff state when a cutoff condition is met. The downstream conductors (first downstream conductors) are configured to be electrically connectable to each other via a conductive member. Connection portions connectable to a conductive member are provided on the respective downstream conductors (first downstream conductors).