An electronic device is provided. The electronic device includes a housing including at least one opened surface, a touchscreen display at least a portion of which is exposed through the opened surface of the housing, and a pressure sensor disposed between the touchscreen display and the housing. The pressure sensor includes a first electrode plate having a first size and a first shape, a second electrode plate having a size and a shape that are the same as or similar to the first size and the first shape and facing the first electrode plate, a dielectric layer disposed in a first area between the first electrode plate and the second electrode plate, and a waterproof member disposed in a second area corresponding to a peripheral area of the first area and at least partially enclosing a space between the first electrode plate and the second electrode plate.