An electronic device is disclosed, including a housing, and an interface structure disposed at least partly in the housing. Th interface structure includes: a substrate, a connection terminal disposed on the substrate, a part of which is exposed to an external environment through a first opening of the housing, a sealing part disposed where the substrate and the connection terminal are connected, blocking exposure of the connected portion to the external environment, a sensor disposed on the substrate adjacent to the connection terminal, a window member disposed on the substrate to cover the sensor while exposing at least a portion of the sensor to the external environment through a second opening of the housing, and a waterproofing member disposed between the window member and the substrate to form a seal between a portion of the window member and the substrate.