The invention relates to a portable electronic device and an optical imaging lens of the same. The optical imaging lens sequentially comprises an aperture, a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis. The portable electronic device comprises a main case and an image module installed in the main case. The image module comprises an optical imaging lens body, a lens barrel, a module back seat unit, a substrate and an image sensor. Through controlling of concave and convex surface arrangement and/or characteristics of refractive index of the lenses and under the condition of maintaining good optical performance, lens length can be shortened.