Piezoelectric driving device, electronic-component-transporting device, robot, projector, and printer

A piezoelectric driving device comprising:

• a first member,
• a second member,
• a guide mechanism that guides the second member relative to the first member in a first direction, and
• a piezoelectric actuator that moves the second member relative to the first member in the first direction,
• wherein the guide mechanism includes a first rail provided on one of the first member and the second member along the first direction and a second rail provided on one of the first member and the second member along the first direction while being spaced apart from the first rail in a second direction orthogonal to the first direction, and
• the piezoelectric actuator, when viewed from a third direction orthogonal to both the first direction and the second direction, is disposed between the first rail or an extended line obtained by extending the first rail in the first direction and the second rail or an extended line obtained by extending the second rail in the first direction.