1. An electronic device, comprising:an electronic module;
a casing, accommodating the electronic module; and
at least one air port, disposed on the casing to communicate the inside of the casing to the outside, the air port comprising:
a first inclined blocking element, having a plurality of first inclined openings, and the first inclined openings inclining relative to a horizontal direction; and
an appearance blocking element, disposed at a periphery of the first inclined blocking element in relation to the casing, and having a plurality of elongated aperture slots and a plurality of bending portions, wherein the elongated aperture slots are arranged in parallel, the bending portions are respectively disposed at the elongated aperture slots to interfere with a movement of airflow, and each of the bending portions extends inwards from a side of the corresponding elongated aperture slot and partially blocks an opening area of the corresponding elongated aperture slot, wherein each of the bending portions has a turning portion located in an inner space of the appearance blocking element.