Abstract: It is aimed to provide a bone-conduction speaker device which makes no leakage of sound annoying the other and does not restrict posture and rolling-over motion of the user when lying on a bed or sitting on a sofa, and which makes highly reliable and excellent transmission and receiving of sound signal as to enable enjoying of music or the like with almost no locational restrictions. The speaker device comprises: a transmitter converting the inputted sound signal into output of infrared signal and then transmitting it; a receiver demodulating the inputted infrared signal into the sound signal; a bone-conduction speaker amplifying the sound signal and outputting it as sound vibration; and a pad-shaped elastic cushioning body holding on its surface the bone-conduction speaker, thereby forming a pad embedded with the bone-conduction speaker(s). Photo-acceptors for the receiver are arranged on fringe of the cushioning body as spaced apart to each other.