A vehicle-mounted surrounding object recognizing apparatus, comprising: a camera that captures an environment surrounding an own vehicle; and an image processing device; wherein the image processing device is configured to process an image captured by the camera to calculate an index value of a color component with respect to an image portion having a luminance value greater than a predetermined value, and determine whether the image portion is related to a light from a surrounding vehicle based on a relationship between the calculated index value of a color component and a predetermined threshold, and the predetermined threshold is changed according to a lighting status of a forward lighting device of the own vehicle.