A cooking appliance with an improved structure to increase visibility to get a better look at the inside of a cooking room during cooking while blocking electromagnetic waves generated in the cooking room from leaking out. The cooking appliance includes a main body configured to have having a cooking room and a door arranged on the front of the main body to open or and close the cooking room. The door includes a door frame configured to have an opening formed to see into the cooking room and a conductive border portion around the opening; a shielding member arranged to cover the opening and having a conductive blocking layer configured to block electromagnetic waves; and a fixing member arranged to combine the door frame and the shielding member.