To provide a plasticizer for a polyvinyl acetal-based resin, having a suitable plasticizing effect toward the polyvinyl acetal-based resin and also having a appropriate volatility, and further a ceramic paste, an electroconductive paste and a dielectric paste by using the plasticizer for the polyvinyl acetal-based resin.

This plasticizer for a polyvinyl acetal-based resin is characterized by having a molecular structure expressed by general formula (1) [wherein, R1 is a 1-6C straight chain-formed or branched alkylene; (n) is 1-5 natural number; and R2, R3 are each a 1-20C straight chain-formed, branched or cyclic alkyl, and may be the same or different].