PURPOSE: To omit a battery in a medical electronic apparatus of an embedded type by providing a piezoelectric type power generating mechanism which is embedded in a living body and generates charge by vibration in the living body, a capacitor for accumulating the generated charge, and an electronic circuit connected to the capacitor.

CONSTITUTION: A piezoelectric bimorph 1 has a constitution in which a piezoelectric element 3 is stuck to one principal plane of a disk-like metallic plate 2, and generates charge by receiving vibration in a living body. As for a piezoelectric material for constituting the piezoelectric bimorph 1, a material whose electro-mechanical conversion efficiency is high, and whose piezoelectric constant (d) is large, for instance, lead zirconate-titanate is used suitably. The charge generated by the piezoelectric bimorph 1 is rectified by allowing it to pass through a rectifying circuit 6. To a post-stage of the rectifying circuit 6, a capacitor 7 is connected, and in the capacitor 7, the rectified charge is accumulate. The charge accumulated in the capacitor 7 is given as a current of a prescribed voltage to an electronic circuit 9 through a constant- voltage circuit 8. To the electronic circuit 9, driving power based on vibration in the living body is given without necessitating a battery, and a surgical operation at the time of changing the battery can be omitted.