To provide a transmitter-receiver that can properly adjust the position of a microphone and the length of an extension cord and to provide a mobile phone that uses the transmitter-receiver and provides ease of talking with safety.

The transmitter-receiver is provided that is characterized in the provision of the extension cord, a removable connection terminal that is placed at one end of the extension cord and inserted to an insertion port of a device main body for connection, an earphone that is provided at the other end of the extension cord, a microphone that is placed on the way of the extension cord, and winders with stoppers that are provided between the connection terminal and the microphone and between the microphone and the earphone respectively. The mobile phone using the transmitter-receiver is provided.