Power-supply device, light fixture, and vehicle

A power-supply device comprising:

• a casing;
• a circuit board;
• and
• at least one electronic component on the circuit board,
• wherein the casing includes a casing portion having an opening, and a cover portion disposed to cover the opening of the casing portion,
• the casing houses the circuit board between the casing portion and the cover portion, and
• the cover portion includes a recess covering the at least one electronic component,
• wherein the casing portion has a through hole formed at a position corresponding to a connector terminal connected to the circuit board, the casing portion includes a wall portion provided by protruding part of the casing portion outward, the wall portion surrounds the through hole and is located away from the through hole, an external shape of the wall portion is circular in a plan view.