1. A 3D image capture device comprising: a light transmitting section with a transmitting area, of which the spectral transmittance characteristic varies in a first direction; an image sensor which is arranged to receive light that has been transmitted through the light transmitting section and which outputs a photoelectrically converted signal representing the light received; an imaging section which produces an image on the image capturing plane of the image sensor; and an image processing section which extracts an edge of a subject in the first direction, which is included in an image that has been generated based on the photoelectrically converted signal supplied from the image sensor, and which estimates information about the depth of the subject based on a lightness or hue pattern of a background in the vicinity of the edge extracted.