Power switching apparatus

A power switching apparatus, configured to switch a power supply source that is configured to supply an electric power to an air conditioner that is mounted on a vehicle that can receive a power supply from a plurality of power sources, includes: a selecting unit configured to select the power supply source during execution of pre-air conditioning in which an operation of the air conditioner is started before start of running of the vehicle; and a setting unit configured to set a power supply to be supplied from the power supply source that is selected by the selecting unit, to the air conditioner.