An optical image lens system includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has a convex object-side surface and a concave image-side surface. The second lens element, the third lens element, and the fourth lens element have refractive power. The fifth lens element with positive refractive power is made of plastic, and has a convex object-side surface and a concave image-side surface, wherein the surfaces thereof are aspheric. The sixth lens element with refractive power is made of plastic, and has a concave image-side surface, wherein the image-side surface thereof changes from concave at a paraxial region to convex at a peripheral region, and the surfaces thereof are aspheric.