An object of the present invention is to supply a semiconductor device capable of communicating data through radio communication, such as an RFID tag or a label-like object, with high productivity at low cost. In the invention, a memory portion, a signal control circuit portion and a communication circuit portion are formed with the use of a TFT formed over an insulating substrate, and the insulating substrate is fixed opposite to a support provided with an antenna so that the antenna is connected to a terminal portion connected to a communication circuit. The invention is an RFID tag and a label-like object including an ID chip whose memory portion, signal control portion and communication circuit portion are formed with the use of TFTs formed over an insulating substrate and an antenna formed to connect to a terminal portion of the ID chip, in which data stored in a memory portion or data to be stored in a memory portion can be communicated through a communication circuit by radio communication.