Provided is a sealed dual membrane (SDM) structure and a device including the same. The SDM structure according to the present invention includes a substrate, a first vibrating membrane and a second vibrating membrane disposed on the substrate, which form a sealed cavity together with the substrate, a first back electrode plate and a second back electrode plate disposed between the vibrating membrane and the second vibrating membrane, and a conductor plate unit disposed between the first back electrode plate and the second back electrode plate. The first vibrating membrane and the second vibrating membrane are mechanically coupled to the conductor plate unit, and the conductor plate unit forms a capacitor structure with each of the first back electrode plate and the second back electrode plate. The present invention reduces the number of pillars required in the SDM structure and increases the sensitivity of the device including the SDM.