An electronic device includes a first housing, an second housing coupled to the first housing, and a flexible sealing member mounted on the second housing. The first housing defines a receiving groove substantially in a shape of a loop. The flexible sealing member includes a fixing portion, a first sealing portion protruding from the fixing portion and substantially in a shape of a ring, and a second sealing portion protruding from the fixing portion and substantially in a shape of a ring. The second sealing portion is surrounded by the first sealing portion. The first sealing portion and the second sealing portion are deformed and received in the receiving groove. The first sealing portion resists the second sealing portion. The first sealing portion and the second sealing portion both resist the first housing.