An electric power transmission apparatus comprising: an electric power transmission portion configured to wirelessly transmit electric power to an electric power reception portion of an electric power reception apparatus of a vehicle; a camera configured to shoot surroundings of the electric power transmission portion; and a controller configured to perform alignment processing and foreign matter sensing processing by using an image shot by the camera, the alignment processing being a process in which the electric power transmission portion and the electric power reception portion are aligned with each other, the controller being configured to calculate the relative positional relation between the electric power transmission portion and the electric power reception portion and to transmit information on said relative positional relation to the vehicle, the foreign matter sensing processing being a process for sensing whether a foreign matter is present between the electric power transmission portion and the electric power reception portion in order, when presence of foreign matter between the electric power transmission portion and the electric power reception portion has been sensed, to suppress overheating of foreign matter during electric power transmission, the controller being configured to select an alignment prioritized mode in which the alignment processing is performed in preference to the foreign matter sensing processing before start of electric power transmission from the electric power transmission portion to the electric power reception portion, and select a foreign matter sensing prioritized mode in which the foreign matter sensing processing is performed in preference to the alignment processing during electric power transmission from the electric power transmission portion to the electric power reception portion; the electric power transmission apparatus being characterized in that the controller is configured to, in the foreign matter sensing prioritized mode, alternately perform the foreign matter sensing processing and the alignment processing with the foreign matter sensing processing being performed in preference to the alignment processing, in order to confirm that the vehicle has not been moved after completion of alignment. an electric power transmission portion configured to wirelessly transmit electric power to an electric power reception portion of an electric power reception apparatus of a vehicle; a camera configured to shoot surroundings of the electric power transmission portion; and a controller configured to perform alignment processing and foreign matter sensing processing by using an image shot by the camera, the alignment processing being a process in which the electric power transmission portion and the electric power reception portion are aligned with each other, the controller being configured to calculate the relative positional relation between the electric power transmission portion and the electric power reception portion and to transmit information on said relative positional relation to the vehicle, the foreign matter sensing processing being a process for sensing whether a foreign matter is present between the electric power transmission portion and the electric power reception portion in order, when presence of foreign matter between the electric power transmission portion and the electric power reception portion has been sensed, to suppress overheating of foreign matter during electric power transmission, the controller being configured to select an alignment prioritized mode in which the alignment processing is performed in preference to the foreign matter sensing processing before start of electric power transmission from the electric power transmission portion to the electric power reception portion, and select a foreign matter sensing prioritized mode in which the foreign matter sensing processing is performed in preference to the alignment processing during electric power transmission from the electric power transmission portion to the electric power reception portion; the electric power transmission apparatus being characterized in that the controller is configured to, in the foreign matter sensing prioritized mode, alternately perform the foreign matter sensing processing and the alignment processing with the foreign matter sensing processing being performed in preference to the alignment processing, in order to confirm that the vehicle has not been moved after completion of alignment. select an alignment prioritized mode in which the alignment processing is performed in preference to the foreign matter sensing processing before start of electric power transmission from the electric power transmission portion to the electric power reception portion, and select a foreign matter sensing prioritized mode in which the foreign matter sensing processing is performed in preference to the alignment processing during electric power transmission from the electric power transmission portion to the electric power reception portion; the electric power transmission apparatus being characterized in that the controller is configured to, in the foreign matter sensing prioritized mode, alternately perform the foreign matter sensing processing and the alignment processing with the foreign matter sensing processing being performed in preference to the alignment processing, in order to confirm that the vehicle has not been moved after completion of alignment.