To provide an electromagnetic transducer to generate an acoustic wave in an electronic hearing aid provided with a case 2, a coil 4 placed therein, an electromagnetic driver 3 including one drive electromagnet 5 and one armature 6 and a diaphragm, that is fixed to the case and mechanically coupled with this armature to convert the motion of the armature into an acoustic wave signal and that reduces the vibration by a drive part and a driven part of the transducer to improve the efficiency of the transducer.

A diaphragm device is provided with two diaphragms 7, 7' and the diaphragms are placed opposite to each other in a driver, formed into the same shape and are driven in opposite directions, so that mechanical total pulse generated by the motion of the driven part and the drive part are minimized.