Electronic device

An electronic device, having a central area and a peripheral area surrounding the central area, and comprising:

• a substrate, having a first surface and a second surface opposite to the first surface;
• a through hole, penetrating through the substrate, and having a first through hole and a second through hole;
• a buffer layer, covering the first surface, the second surface, an inner wall of the first through hole and an inner wall of the second through hole;
• a first circuit structure, disposed on the first surface;
• an electronic component, disposed on the first circuit structure and corresponding to the central area;
• and
• a first pad, disposed on the second surface, and electrically connected to the electronic component through the through hole and the first circuit structure,
• wherein the first through hole corresponds to the central area, the second through hole corresponds to the peripheral area, and a width of the second through hole is greater than a width of the first through hole.