Piezoelectric actuator

A piezoelectric actuator for driving an object, comprising:

• a piezoelectric element having a rectangular shape and including a pair of main surfaces opposing each other, a first end surface and a second end surface opposing each other in a long side direction of the pair of main surfaces, and a first side surface and a second side surface opposing each other in a short side direction of the pair of main surfaces;
• a first supporter opposing the object in the long side direction via the piezoelectric element and supporting the first end surface;
• and
• a second supporter opposing a disposition surface of a housing in which the piezoelectric element is disposed in the short side direction via the piezoelectric element and supporting the first side surface,
• wherein the first supporter is provided to be movable according to deformation of the first end surface,
• the second supporter is provided to be movable according to deformation of the first side surface, and
• the first supporter includes an opposing portion opposing the second supporter in the long side direction, and a protruding portion protruding from the opposing portion in the long side direction and abutting on the second supporter.