An extraneous-matter removing apparatus according to an embodiment includes a connector, a detector, and a removal unit. The connector is connected with a branch wire branching from a camera wire. The camera wire transmits a start-up signal for starting up a camera provided outside of a vehicle. The detector detects the start-up signal flowing through the branch wire connected with the connector. The removal unit performs, when the detector detects the start-up signal, a removing operation of an extraneous matter attached to the camera.