The present invention relates to a telecentric lens system for a smartphone, which has an effect of facilitating the design of a telecentric lens system for a smartphone, and a front lens unit 100 for receiving light rays emitted from the object 10 side, Aperture 200 located at the rear of the front lens unit 100 to control the amount of light transmitted to the rear, and a rear lens unit at which a smartphone camera that is located at the rear of the stop 200 and refracts the transmitted light is located ( 300) and an image sensor 400 in which an image corresponding to the object is formed, wherein the diameter of the aperture 200 satisfies Equation 1 below. [Equation 1] (Where D is the diameter of the aperture 200, f is the focal length of the front lens unit 100, and -w 0 is the height of the object located in front of the front lens unit 100, moving downward from the non-axis point The angle between the peripheral light and the main light, w 0 is the angle between the peripheral light and the main light traveling upward from the non-axis point which is the height of the object located in front of the front lens unit 100
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