One embodiment of the present invention provides a structure for mounting a camera on a vehicle, the structure including: a base unit fixed to a vehicle body; a camera; a slide mechanism configured to allow the camera to slide in an attaching direction so as to be detachably engaged with the base unit; protrusions provided on one of the base unit and the camera, the protrusions being disposed at front left and right sides and rear left and right sides with respect to the attaching direction; and contact portions provided on the other of the base unit and the camera, the contact portions laterally contacting the front left and right protrusions and the rear left and right protrusions, respectively, thereby positioning the camera with respect to the base unit.