Power supply apparatus

A power supply apparatus comprising:

• a housing being self-standing and having an opening on a front side;
• and
• a unit disposed in the housing so as to be insertable and removable in a front-back direction through the opening,
• the unit comprising a lower-left slide portion positioned at a left lower end when facing forward from inside the housing, a lower-right slide portion positioned at a right lower end when facing forward from inside the housing, and a hook portion disposed between the lower-left slide portion and the lower-right slide portion,
• the hook portion including a hook base portion extending downward, and a hook tip portion extending forward from a lower end of the hook base portion,
• a left rail supporting the lower-left slide portion of the unit and extending in the front-back direction, a right rail supporting the lower-right slide portion of the unit and extending in the front-back direction, and a stopper disposed so as to connect an intermediate portion of the left rail and an intermediate portion of the right rail being arranged in the housing,
• the stopper having an inclined surface becoming lower toward the front side, and a stopper back end side extending in a right-left direction at a height and being exposed to a back side, the height being higher than an upper end of the hook tip portion of the unit and lower than an upper end of the hook base portion of the unit in a state where disposition in the housing is completed.