Laminated piezoelectric material, ultrasound probe, and ultrasound diagnostic apparatus

A laminated piezoelectric material comprising a four-layered piezoelectric material and electrode layers for applying a voltage to each layer of the four-layered piezoelectric material,

• wherein each piezoelectric material of the four-layered piezoelectric material comprises an inorganic piezoelectric material as a principal component and has a remanent polarization in a thickness direction, and
• the layer of the four-layered piezoelectric material is laminated so that,
• a direction of an electric field counters to a direction of the remanent polarization in only one of the piezoelectric material of the four-layered piezoelectric material and the direction of the electric field coincides with the direction of the remanent polarization in other three layers, or
• the direction of the electric field coincides with the direction of the remanent polarization in only one of the piezoelectric material of the four-layered piezoelectric material and the direction of the electric field counters to the direction of the remanent polarization in other three layers,
• when the voltage is applied to each piezoelectric material of the four-layered piezoelectric material via the electrode layers.