A case keyboard with thin film switches is provided. The case keyboard includes a case, a tablet PC fixing frame and a keyboard main body. The tablet PC fixing frame is fixedly installed on a surface of the case, and the keyboard main body is fixedly installed on the other surface of the case. The keyboard main body includes keys/keycaps, a fixing film/air hole layer, metal domes, an air slot layer, a conductive film/PCB and a key plate. The key plate is disposed above the lowest layer and is fixedly installed on the case. The conductive film/PCB is disposed above the key plate, the air slot layer is disposed above the conductive film/PCB, and the metal domes are disposed above conductive film/PCB. More than one metal dome is disposed corresponding to key configurations on the keyboard, the fixing film/air hole layer is disposed above the metal domes, and the keys/keycaps are disposed above the fixing film/air hole layer. The present invention has characteristics of being light, thin, and easy to carry, and having a Bluetooth function, a short stroke, and lower noises, etc.