An electronic device including a main body, a carrying layer disposed at the main body, a waterproof layer stacked on the carrying layer and located between the carrying layer and the main body, a supporting element disposed on the carrying layer, a key disposed on the supporting element, and a guiding element connected to the key is provided. The main body has an inner space and an opening exposing the inner space. The carrying layer covering the opening has a first ventilation hole and an assembly hole. The waterproof layer has a second ventilation hole. The first ventilation hole is exposed by the second ventilation hole and connected with the inner space. The assembly hole is covered by the waterproof layer. The supporting element covers the first ventilation hole and has a third ventilation hole connected with the first ventilation hole. The guiding element is locked at the assembly hole.