An electronic device is provide, and may include a first cover forming a first surface of the electronic device, a second cover forming a second surface of the electronic device, the second surface being positioned opposite the first surface, and a camera assembly at least partially disposed in a space between the first cover and the second cover, wherein the camera assembly may include an image sensor, a board having the image sensor mounted thereon and including at least one cut around the image sensor, a lens assembly disposed adjacent to a light-receiving surface of the image sensor, a side wall surrounding at least a portion of the lens assembly and having a protrusion fitted in the at least one cut, and at least one solid body provided between at least a portion of an inner surface of the at least one cut and the protrusion.