Provided are an earphone device in which a cable configured to be able to respond in a wide range to press and having switch functions is applied to an earphone to make it easy even for a user who uses the earphone device for the first time to operate the earphone device, and which includes switch parts in three places, so that these three parts are selected and pressed as appropriate when necessary, thereby allowing desired operations to be easily performed, is less liable to false operation, and eliminates the need to, for example, indicate operating ranges, and a sound-reproducing system using this earphone device. The earphone device is provided with a first earphone body in which an electro-acoustic transducer is built; a first cable one end of which is connected to this first earphone body and within which a switch member to be turned on by one-way press is disposed over a predetermined range along the length direction of the cable so that the cable has switch functions; a second earphone body in which an electro-acoustic transducer is built; and a second cable one end of which is connected to this second earphone body and within which a switch member to be turned on by one-way press is disposed over a predetermined range along the length direction of the cable so that the cable has switch functions, wherein a switch is shunted into two switches by the first and second cables, the first and second cables are arranged one on top of the other, and an overlapped portion is unidirectionally pressed to simultaneously turn on the switches. In addition, a sound-reproducing system is configured by combining a mobile terminal which operates in conjunction with this earphone device.