The power transmission apparatus includes a power transmitting unit which transmits power to a first power receiving unit in a non-contact manner, a housing which accommodates the power transmitting unit, a second power receiving unit which is disposed on a sidewall of the housing and receives the power from the power transmitting unit in a non-contact manner, and an electric load which operates with power that the second power receiving unit has received. The power transmission apparatus operates only with a leakage magnetic flux and operates of a notification such as a non-contact power supply is in progress.