Power supply device

A power supply device comprising:

• an outer case;
• a battery block housed in the outer case and including at least one or more secondary batteries;
• a circuit board connected to the battery block;
• and
• a power supply connector connected to an output lead that outputs an output current from the battery block,
• wherein the power supply connector is attached in a floating state to a fixed surface of the outer case,
• the circuit board is disposed in parallel to a first direction orthogonal to the fixed surface, between the fixed surface and the battery block,
• the output lead is disposed in wiring space provided in a lower side or an upper side of the circuit board, and connected to the battery block, and
• the output lead includes a first region extending from the power supply connector toward the battery block, and a battery block side of the first region is coupled to the battery block via at least one of a protective element and the circuit board.