An optical image lens assembly 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 an object-side surface being convex. The second lens element with positive refractive power has an image-side surface being convex. The fourth lens element has an image-side surface being concave. The fifth lens element with positive refractive power has an object-side surface being concave and an image-side surface being convex. The sixth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof and including at least one convex shape in an off-axial region thereof. The two surfaces of each of the fifth lens element and the sixth lens element are aspheric.