Power-supply unit and power supply

A power-supply unit comprising:

• an electric connection box disposed in a vehicle compartment and operable to supply an electric power of a battery to a plurality of loads, the electric connection box including an electric connection box side input terminal electrically connectable to the battery and an electric connection box side output terminal electrically connectable to the plurality of loads;
• and
• a power supply disposed in the vehicle compartment and operable to control a first voltage that is supplied from the battery and outputted through the electric connection box and supply a second voltage that is controlled from the first voltage to the plurality of loads through the electric connection box, the power supply including a power supply side input terminal that is directly connected to the electric connection box side input terminal, wherein the first voltage is inputted to the power supply side input terminal through the electric connection box, and a power supply side output terminal that is directly connected to the electric connection box side output terminal, wherein the second voltage is supplied to the plurality of loads through the electric connection box, wherein the power supply input terminal and the power supply output terminal of the power supply each respectively plug into the corresponding power supply side input terminal and the power supply side output terminal of the electric connection box, and the power supply is directly supported by and fixed to the electric connection box.