The invention relates to an optical imaging lens and an electronic device applying the optical imaging lens. The optical imaging lens comprises six lenses and is characterized in that an object side surface of the second lens is provided with a convex surface portion located in an area nearby an optical axis and a concave surface portion located in an area nearby the circumference; an image side surface of the third lens is provided with a convex surface portion located in an area nearby the optical axis and a concave surface portion located in an area nearby the circumference; an object side surface of the fourth lens is provided with a concave surface portion located in an area nearby the optical axis; an object side surface of the fifth lens is provided with a convex surface portion located in an area nearby the optical axis; and the ratio of the total sum of thicknesses of the six lenses on the optical axis I ALT to an air gap G23 between the second lens and the third lens on the optical axis meets the formula that ALT/G23 is less than or equal to 21.00. The electronic device provided by the invention comprises a casing and an image module, wherein the image module is installed in the casing and comprises the optical imaging lens, a lens cone, a module rear base unit and an image sensor. The optical imaging lens and the electronic device applying the optical imaging lens can provide excellent imaging quality.