To provide an electrostatic induction type conversion device having high mechanical-electrical conversion efficiency.

The electrostatic induction type conversion device 1, to convert electrical energy and kinetic energy, comprises: a base material 21 whose one principal plane is made of a conductor; a dielectric polarization body 10 formed on the principal plane; and an electrode 22, disposed opposite to a surface 10s of the dielectric polarization body 10, to move relatively with the dielectric polarization body 10 so as to change an area opposing to the surface 10s. The dielectric polarization body 10 is made of a ferroelectric material with crystal orientation.