A target detection apparatus detects a target object from within an image by utilizing reflection characteristics in both a visible light range and an infrared light range of the target object. Image pickup devices output a plurality of mutually different color components and an infrared light component from incident light. A control unit generates hue components for respective regions from the plurality of color components and determines whether the regions represent a target object or not by using the hue components and the infrared light component in the regions. Alternatively, the control unit performs a predetermined computation between each of at least two kinds of color components and an infrared light component and determines whether a region corresponding to the computed components represents a target object, according to the computation result.