Image processing apparatus

The invention provides an image processing device capable of accurately ascertaining the situation of the surroundings of a vehicle. The control unit generates a surrounding image, which is an image of the surroundings of the vehicle when the vehicle is viewed from a viewpoint outside the vehicle, on the basis of a captured image acquired from an imaging device provided in the vehicle, generates a composite image, which is an image obtained by synthesizing the vehicle image into the surrounding image, and displays the composite image on the display device. A vehicle image indicating a vehicle when the vehicle is viewed from a viewpoint outside the vehicle, and a control unit performs an automatic rotation control outside the vehicle and a manual rotation control outside the vehicle, and changes the transmittance of the vehicle image in the automatic rotation control outside the vehicle and the manual rotation control outside the vehicle, the manual rotation control outside the vehicle being controlled by the