A power transmission control device adapted to be used in a power transmitting device of a non-contact power transmission system, the non-contact power transmission system performing non-contact power transmission from the power transmitting device to a power receiving device via a primary coil and a secondary coil that are electromagnetically coupled, the power transmission control device comprising: a power-transmitting-side control circuit configured to control power transmission to the power receiving device, the power-transmitting-side control circuit configured for: - causing the power transmitting device to perform intermittent temporary power transmission, - detecting a response from the power receiving device that has received the temporary power transmission to detect installation of a power-receiving-side instrument that includes the power receiving device in an area in which power transmitted via non-contact power transmission can be received, - causing the power transmitting device to perform continuous normal power transmission to the power receiving device when the installation of the power-receiving-side instrument has been detected, and - causing the power transmitting device to continuously perform the intermittent temporary power transmission when the installation of the power-receiving-side instrument has not been detected; the intermittent temporary power transmission being intermittent power transmission performed before the normal power transmission for detecting installation of the power-receiving-side instrument; the normal power transmission being power transmission for supplying power to a load of the power receiving device for charging the load; the power-transmitting-side control circuit being configured for causing the power transmitting device to perform power transmission for removal detection after full-charging of the load; the power transmission for removal detection after full-charging of the load being intermittent power transmission in a first intermittent cycle; and the first intermittent cycle being longer than an intermittent cycle of the intermittent temporary power transmission. a power-transmitting-side control circuit configured to control power transmission to the power receiving device, the power-transmitting-side control circuit configured for: - causing the power transmitting device to perform intermittent temporary power transmission, - detecting a response from the power receiving device that has received the temporary power transmission to detect installation of a power-receiving-side instrument that includes the power receiving device in an area in which power transmitted via non-contact power transmission can be received, - causing the power transmitting device to perform continuous normal power transmission to the power receiving device when the installation of the power-receiving-side instrument has been detected, and - causing the power transmitting device to continuously perform the intermittent temporary power transmission when the installation of the power-receiving-side instrument has not been detected; - causing the power transmitting device to perform intermittent temporary power transmission, - detecting a response from the power receiving device that has received the temporary power transmission to detect installation of a power-receiving-side instrument that includes the power receiving device in an area in which power transmitted via non-contact power transmission can be received, - causing the power transmitting device to perform continuous normal power transmission to the power receiving device when the installation of the power-receiving-side instrument has been detected, and - causing the power transmitting device to continuously perform the intermittent temporary power transmission when the installation of the power-receiving-side instrument has not been detected; the intermittent temporary power transmission being intermittent power transmission performed before the normal power transmission for detecting installation of the power-receiving-side instrument; the normal power transmission being power transmission for supplying power to a load of the power receiving device for charging the load; the power-transmitting-side control circuit being configured for causing the power transmitting device to perform power transmission for removal detection after full-charging of the load; the power transmission for removal detection after full-charging of the load being intermittent power transmission in a first intermittent cycle; and the first intermittent cycle being longer than an intermittent cycle of the intermittent temporary power transmission.