To provide a loudspeaker device capable of accurately reducing non-linear strain generated from a loudspeaker.

A linear-signal generator 10 imitatively generates a linear signal based on the transfer function of a linear component in the transfer functions from an input to an amplifier 14 to an output from a sensor 16, and outputs the linear signal to an adder 12. The sensor 16 detects the vibration or sound output of the loudspeaker 15, and outputs a detecting signal to the adder 12. The adder 12 subtracts the linear signal from the detecting signal of the sensor 16, and outputs the subtracted signal as an error signal. The error signal output from the adder 12 is outputted to the adder 11 through a feedback control filter 13, and negatively fed back to an input acoustic signal in the adder 11.