Abstract: In a partition wall panel of the present invention, a panel is formed by arranging a plurality of plates at an interval in the direction of the thickness of the plates and by joining the plates along at least part of the peripheries of the plates or/and at part of the surfaces of the plates using a joint member, and a plurality of such panels are integrated while arranged side by side through a plurality of air layers, and connected along at least part of the peripheries thereof or/and at part of the surfaces thereof using a connecting member. As a result of this construction, a thin, light-weight, and highly sound-insulating multi-layered panel structure can be provided.