Abstract: A key structure is stacked on a display panel. The key structure includes a trigger plate, a frame, at least an elastic triggering member, and at least a key. The trigger plate is formed with at least a hollow area for the display panel to partially expose and a solid area. The frame is disposed on the trigger plate and is formed with at least an opening opposite the hollow area. The key includes a key cap and a scissor member connected to the key cap, wherein the key cap has a cap body which is located in the opening and helps directly observing the hollow area and at least two skirts which extend from sides of the cap body and are covered by the frame.