Abstract: An actuator device includes: a piezoelectric element; a weight secured to one end of the piezoelectric element along an expansion-contraction direction thereof; and a drive member secured to another end of the piezoelectric element. The piezoelectric element and the weight are in contact so as to have a spatial overlap with respect to the expansion-contraction direction of the piezoelectric element, and the center of gravity of the weight is positioned in the vicinity of a plane that contains a contact plane in which the piezoelectric element and the weight are in contact.

Abstract: An object of the invention is to provide an actuator device that realizes improvements in impact resistance as well as size reduction and thickness reduction of the device. An actuator device according to the invention includes: a piezoelectric element; a weight secured to one end of the piezoelectric element along an expansion-contraction direction thereof; and a drive member secured to another end of the piezoelectric element. The piezoelectric element and the weight are in contact so as to have a spatial overlap with respect to the expansion-contraction direction of the piezoelectric element, and the center of gravity of the weight is positioned in the vicinity of a plane that contains a contact plane in which the piezoelectric element and the weight are in contact.

Abstract: An excellent image pickup device whose size and thickness are reduced is realized with a simple structure, and thus the slimming down of a mobile terminal device is accomplished. A slim image pickup device in which a plate-like member 8 having a stepped portion 8A around an opening portion 9, an optical filter 5 arranged on an inside of the stepped portion 8A to cover the opening portion, a wiring substrate 7 arranged on an outside of the stepped portion to be fitted, a semiconductor image pickup element 6 flip-chip mounted on the wiring substrate 7, and a lens 2 positioned/fitted on the plate-like member 8 are provided is realized.