Disclosed is an electronic device including a glass member having a flat portion and a side portion extending from an edge of the flat portion in at least a partially slanted or curved manner. The side portion includes a first curved portion extending from the flat portion, a second curved portion extending from the first curved portion and connected to the flat portion through the first curved portion, and at least one processing portion formed by at least a part of a border region between the first curved portion and the second curved portion. The at least one processing portion has a different refractive index from at least another portion of the side portion.