An imaging apparatus comprising: a zoom illuminating system (100, 101, 102) having an adjustable illumination range and comprising: a light source comprising a light emitting device emitting light in an infrared band; and a lens unit (120, 130, 140) comprising a first lens (121, 131, 141) and a second lens (122, 132, 142) disposed between the first lens (121, 131, 141) and the light source, wherein the illumination range is adjusted by adjusting a distance between the first (121, 131, 141) and second (122, 132, 142) lenses, and wherein the first lens (121, 131, 141) is fixed and the second (122, 132, 142) lens moves together with the light source, wherein the first lens (121, 131) has positive refractive power, wherein an effective diameter of the first lens (121, 131, 141) is larger than an effective diameter of the second lens (122, 132, 142), a zoom lens system comprising a plurality of lens groups, the zoom lens system being arranged to zoom an image of an object as a distance between the plurality of lens groups varies; an image pickup device changing an optical image formed by the zoom lens system to an electric signal; and a control unit arranged to control the zoom lens system and the zoom illumination system (100, 101, 102) to be interlocked with each other so that the zooming of the zoom lens system is interlocked with the adjustment of an illumination range of the zoom illuminating system (100, 101, 102), wherein the control unit adjusts the zoom magnification of zoom lens system and drives the zoom illuminating system (100, 101, 102) so that the zoom illuminating system (100, 101, 102) forms a illumination range corresponding to the zoom magnification. a zoom illuminating system (100, 101, 102) having an adjustable illumination range and comprising: a light source comprising a light emitting device emitting light in an infrared band; and a lens unit (120, 130, 140) comprising a first lens (121, 131, 141) and a second lens (122, 132, 142) disposed between the first lens (121, 131, 141) and the light source, wherein the illumination range is adjusted by adjusting a distance between the first (121, 131, 141) and second (122, 132, 142) lenses, and wherein the first lens (121, 131, 141) is fixed and the second (122, 132, 142) lens moves together with the light source, wherein the first lens (121, 131) has positive refractive power, wherein an effective diameter of the first lens (121, 131, 141) is larger than an effective diameter of the second lens (122, 132, 142), a light source comprising a light emitting device emitting light in an infrared band; and a lens unit (120, 130, 140) comprising a first lens (121, 131, 141) and a second lens (122, 132, 142) disposed between the first lens (121, 131, 141) and the light source, wherein the illumination range is adjusted by adjusting a distance between the first (121, 131, 141) and second (122, 132, 142) lenses, and wherein the first lens (121, 131, 141) is fixed and the second (122, 132, 142) lens moves together with the light source, wherein the first lens (121, 131) has positive refractive power, wherein an effective diameter of the first lens (121, 131, 141) is larger than an effective diameter of the second lens (122, 132, 142), a zoom lens system comprising a plurality of lens groups, the zoom lens system being arranged to zoom an image of an object as a distance between the plurality of lens groups varies; an image pickup device changing an optical image formed by the zoom lens system to an electric signal; and a control unit arranged to control the zoom lens system and the zoom illumination system (100, 101, 102) to be interlocked with each other so that the zooming of the zoom lens system is interlocked with the adjustment of an illumination range of the zoom illuminating system (100, 101, 102), wherein the control unit adjusts the zoom magnification of zoom lens system and drives the zoom illuminating system (100, 101, 102) so that the zoom illuminating system (100, 101, 102) forms a illumination range corresponding to the zoom magnification.