An imaging apparatus comprising: four ranging light sources ; an imaging element ; a lens unit that focuses light on the imaging element; an aperture having a rectangular frame shape surrounding the imaging element and the lens unit, the aperture including four swelling parts swelling toward a centre on the lens unit side and four through holes through which light emitted from the ranging light source passes, wherein one of the four through holes is provided at each of the four swelling parts, the four swelling parts being provided integrally at four corners of the aperture, the through holes having a diameter gradually increasing along a direction in which light emitted from the ranging light source passes, the holes being integrally provided at the swelling part; and four ranging lenses disposed on an optical path of the light emitted from the ranging light source, wherein the aperture includes a plurality of press-fit convex parts provided at each of the four swelling parts surrounding the through holes and projecting in a direction opposite to the ranging light source, the ranging lens being press-fitted into a region surrounded by the plurality of press-fit convex parts , the ranging lens comprises a plurality of projections projecting from a side surface of the ranging lens, the plurality of press-fit convex parts are each located between two adjacent projections of the plurality of projections, and the diameter (D) of the region of the ranging lens excluding the projections is the same as or longer than the diameter (d) of the region surrounded by the plurality of press-fit convex parts . four ranging light sources ; an imaging element ; a lens unit that focuses light on the imaging element; an aperture having a rectangular frame shape surrounding the imaging element and the lens unit, the aperture including four swelling parts swelling toward a centre on the lens unit side and four through holes through which light emitted from the ranging light source passes, wherein one of the four through holes is provided at each of the four swelling parts, the four swelling parts being provided integrally at four corners of the aperture, the through holes having a diameter gradually increasing along a direction in which light emitted from the ranging light source passes, the holes being integrally provided at the swelling part; and four ranging lenses disposed on an optical path of the light emitted from the ranging light source, wherein the aperture includes a plurality of press-fit convex parts provided at each of the four swelling parts surrounding the through holes and projecting in a direction opposite to the ranging light source, the ranging lens being press-fitted into a region surrounded by the plurality of press-fit convex parts , the ranging lens comprises a plurality of projections projecting from a side surface of the ranging lens, the plurality of press-fit convex parts are each located between two adjacent projections of the plurality of projections, and the diameter (D) of the region of the ranging lens excluding the projections is the same as or longer than the diameter (d) of the region surrounded by the plurality of press-fit convex parts . <EOS>