A sound insulation device includes: a glass sheet composite including a plurality of glass plates being laminated, and partitioning an interior space and an exterior space; a vibration output unit vibrating the glass sheet composite according to an input signal; an exterior sound detection unit detecting a sound from a noise source or a vibration source and outputting a reference signal according to a detection result, the sound being correlated with a sound wave vibration induced in the glass sheet composite; an interior sound detection unit detecting a sound in the interior space and outputting an error signal according to a detection result; and a control unit including an adaptive filter that generates a cancel signal having a phase opposite to a phase of the reference signal to minimize the error signal, and outputting the cancel signal from the adaptive filter to the vibration output unit.