| 摘要 |
Provided is a highly durable multi-layer piezoelectric element wherein an external electrode has less possibilities of being peeled off from a side face of a stacked body even when the element is continuously driven for a long period of time in a high electrical field under high pressure. In a multi-layer piezoelectric element (1), a void (2) is formed in a joining interface between a side face of a stacked body (7) wherein piezoelectric layers (3) and internal electrode layers (5) are alternately laminated and an external electrode (9) joined to the side face. Since stress generated in the joining interface between the side face of the stacked body (7) and the external electrode (9) during driving can be reduced by the void (2), there are less possibilities of having the external electrode (9) peeled off from the side face of the stacked body (7) even when the element is continuously driven for a long period of time.
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