Earphone capable of detecting whether to be worn

An earphone is provided to accurately judge whether the earphone is put on a user's ear, if a touch sensor is installed apart from an earphone head. An earphone includes a touch sensor having a reference terminal and a detection terminal for outputting a touch signal according to capacitance variations between the reference and the touch terminal. A touch detecting wire(48) has one end connected to the detection terminal and the other end connected to an earphone head(20). A reference detection wire(46) has one end connected to the reference terminal and the other end disposed adjacent to the touch detection wire. A sound signal wire(42) is connected to an earphone jack and the earphone head.