A lens module of the present invention includes a first lens having a positive refractive force; a second lens having a positive refractive force; and a third lens having a negative refractive force. The first lens satisfies a conditional expression 1. [Conditional expression 1]= Nd1 - Nd2 < 0.08 (The Nd1 is a refractive index of the first lens, and the Nd2 is a refractive index of the second lens).
