Piezoelectric element

1. A piezoelectric element, comprising:

a base part that is configured from a piezoelectric layer; and

a laminate that is configured by a first internal electrode and a second internal electrode, which are alternately laminated with the piezoelectric layer interposed therebetween, and that includes a displacement part extending from the base part in a laminating direction of the first internal electrode and the second internal electrode, wherein

the displacement part has a shape in which, when viewed from the laminating direction, a length of a first direction which is orthogonal to the laminating direction is longer than a length of a second direction which is orthogonal to the first direction and the laminating direction,

the displacement part includes a first portion in which the first internal electrode and the second internal electrode overlap in the laminating direction, and a second portion in which the first internal electrode and the second internal electrode do not overlap in the laminating direction,

an opening is formed in at least one of the first internal electrode and the second internal electrode in the second portion, and

the piezoelectric layer is disposed in the opening so that portions of the piezoelectric layer that face each other across the first internal electrode or the second internal electrode are bonded via the opening.

2. The piezoelectric element according to claim 1 , wherein the at least one of the first internal electrode and the second internal electrode in which the opening is formed is disposed on a base part side of the displacement part.

3. The piezoelectric element according to claim 1 , wherein an opening is formed in at least one of the first internal electrode and the second internal electrode in the first portion, the at least one electrode in which the opening in the first portion is formed being disposed on a base part side of the displacement part.