An iris recognition apparatus for recognizing iris in an eyeball, the apparatus comprising: a first image collection unit collecting a first image of the eyeball; a second image collection unit comprising a lens having a larger angle of view than a lens of the first image collection unit and collecting a second image of the eyeball; and a control unit correcting the first image according to a ratio between the angle of view of the lens of the first image collection unit and the angle of view of the lens of the second image collection unit , and measuring the distance between the eyeball and the iris recognition apparatus according to the first image corrected and the second image, wherein the control unit samples the first image with a ratio obtained by dividing the angle of view of the lens of the first image collection unit by the angle of view of the lens of the second image collection unit (391, 591, wherein the angle of view of the lens of the second image collection unit is a multiple of the angle of view of the lens of the first image collection unit in ratio, wherein the control unit measures a distance r between the iris recognition apparatus and the eyeball by using the following expression: r = f 2 × b / d 1 / n + d r 2 , wherein f 2 is a focal length of the second image collection unit , b is a distance between the first image collection unit and the second image collection unit , d r2 is a distance of an eyeball of the second image, n is an angle of view of a lens of the second image collection unit divided by an angle of view of a lens of the first image collection unit , d l is a distance of an eyeball of the first image. a first image collection unit collecting a first image of the eyeball; a second image collection unit comprising a lens having a larger angle of view than a lens of the first image collection unit and collecting a second image of the eyeball; and a control unit correcting the first image according to a ratio between the angle of view of the lens of the first image collection unit and the angle of view of the lens of the second image collection unit , and measuring the distance between the eyeball and the iris recognition apparatus according to the first image corrected and the second image, wherein the control unit samples the first image with a ratio obtained by dividing the angle of view of the lens of the first image collection unit by the angle of view of the lens of the second image collection unit (391, 591, wherein the angle of view of the lens of the second image collection unit is a multiple of the angle of view of the lens of the first image collection unit in ratio, wherein the control unit measures a distance r between the iris recognition apparatus and the eyeball by using the following expression: r = f 2 × b / d 1 / n + d r 2 , wherein f 2 is a focal length of the second image collection unit , b is a distance between the first image collection unit and the second image collection unit , d r2 is a distance of an eyeball of the second image, n is an angle of view of a lens of the second image collection unit divided by an angle of view of a lens of the first image collection unit , d l is a distance of an eyeball of the first image. <EOS>