IN-VEHICLE POWER SUPPLY APPARATUS

An in-vehicle power supply apparatus is used in an in-vehicle power supply system. The in-vehicle power supply system includes a battery, a capacitor, and a power path provided between the battery and the capacitor. The in-vehicle power supply apparatus includes a plurality of relay circuits provided on the power path between the battery and the capacitor, each relay circuit including a relay and a parallel circuit provided in parallel to the relay. The parallel circuit has a configuration in which a parallel relay and a resistor unit are connected in series.