To provide a droplet generator which enhances the efficiency of a transducer.

The droplet generator comprises a pressure chamber 35 defined by the structure of a chamber wall 235, a diaphragm plate 37 disposed on the chamber wall to cover the pressure chamber 35, and a piezoelectric transducer 39 whose bottom face is attached to the diaphragm plate 37, wherein the diaphragm plate 37 has a recess 51 formed thereon, the recess 51 being positioned under a peripheral part 239 of the piezoelectric transducer 39 so that the peripheral part 239 overhangs the recess 51.