A piezoelectric vibrating device comprises a metallic containing member, a piezoelectric member and a heat dissipating and conducting member. The piezoelectric member is provided within the metallic containing member, and the heat dissipating and conducting member includes a plurality of the heat dissipating and conducting fins. Each the heat dissipating and conducting fin has a first heat conduction connecting end and a second heat conduction connecting end, wherein the first heat conduction connecting end is provided on an external surface of the piezoelectric member, and the second heat conduction connecting end is connected with an inner wall surface of the metallic containing member. The piezoelectric member generates vibrations with specific polarization directions based on a piezoelectric controlling signal, and the heat energy generated from the vibration of the piezoelectric member is conducted to the external wall surface of the metallic containing member through the heat dissipating and conducting member.