Stereo headset comprised wired/wireless sub earphone

A headset is provided to listen a sound signal such as a music with a stereo sound through a further installed earphone. A headset includes a main body(10), a main earphone(12), and a sub earphone(13). The main body has a plurality of key buttons which are installed on an external. An installation groove is formed on a side of the main body. The main earphone is fixedly installed on a side of the main body. The sub earphone is detachably installed on the installation groove with a wire cable or a wireless communication. If the sub earphone is connected to the main body by the wire cable, a winding unit which winds a cable is installed inside the main body. A gripping groove(17) for withdrawing the sub earphone is further installed on the installation groove.