POWER TRANSMITTING APPARATUS, POWER RECEIVING APPARATUS, CONTROL METHODS THEREOF, AND STORAGE MEDIUM

A power transmitting apparatus measures a Q factor of a power transmitting unit that performs wireless power transfer to a power receiving apparatus, and determines presence/absence of an object different from the power receiving apparatus based on the Q factor. The power transmitting apparatus obtains a first index value regarding a predetermined physical amount different from the Q factor after measurement of the Q factor, obtains a second index value regarding the predetermined physical amount before wireless power transfer to the power receiving apparatus starts after the it is determined in the above determination that an object different from the power receiving apparatus does not exist; and determines presence/absence of an object different from the power receiving apparatus based on the first index value and the second index value.