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. The second lens element and the third lens element have positive refractive power. The fourth lens element has 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 at least one surface thereof is aspheric. The sixth lens element with refractive power is made of plastic and has a concave image-side surface, wherein at least one surface thereof is aspheric, and the image-side surface thereof changes from concave at a paraxial region to convex at a peripheral region.