A three-lens-element taking lens system for forming an image on a solid-state image sensor has, from the object side, a first lens element having a positive optical power, an aperture stop, a second lens element having a positive optical power, and a third lens element having a negative optical power and having a concave surface pointing to the image side. Of the first and second lens elements, one is a glass lens element and the other is a plastic lens element. The third lens element is a plastic lens element.