A reader writer (a communication device) executes at least one of reading identification information of an IC tag (an identification component) and writing the identification information to the IC tag. The reader writer includes a CPU board (a control board) that includes CPU (a controller) and a wireless control circuit to output radio waves by a command from the CPU, an antenna that is spaced from the CPU board, and a connection cable that electrically connects the CPU board to the antenna. The CPU board includes a disconnection detector that detects a disconnection of the connection cable, and a transmission controller that interrupts an output from the wireless control circuit to the antenna when the disconnection detector judges that the connection cable is disconnected.