A power supply apparatus includes: a power supply portion connected to a power receiving portion of an electrical apparatus and configured to supply electric power to the power receiving portion; an arm including a tip end at which the power supply portion is provided, the arm further including at least one of a linear motion joint portion and a rotational joint portion; and a controller. The controller controls at least one of the linear motion joint portion and the rotational joint portion to move the arm such that the power supply portion is connected to the power receiving portion.