An actuator (100, 100a, 100b, 100c), comprising: an actuating portion having a first actuating area, a second actuating area, and at least one connecting section between the first actuating area and the second actuating area, wherein the first actuating area is movable with respect to the second actuating area; a piezoelectric unit having a first signal area and a second signal area, wherein the first signal area and the second signal area are provided in a same plane, with an isolating portion provided between the first signal area and the second signal area, and the piezoelectric unit is provided at a position corresponding to the first actuating area of the actuating portion; and a conduction unit comprising a first electrode and a second electrode, wherein the first signal area of the piezoelectric unit is electrically connected to the first electrode of the conduction unit, and the second signal area of the piezoelectric unit is electrically connected to the second electrode of the conduction unit; characterized in that the actuator (100, 100a, 100b, 100c) further comprises a supporting portion, wherein the supporting portion and the piezoelectric unit are located in a same plane, the piezoelectric unit and the supporting portion are located on the same side of the actuating portion, and the supporting portion is provided at a position corresponding to the second actuating area of the actuating portion; and the actuator (100, 100a, 100b, 100c) further comprises a levelness regulating portion, wherein the piezoelectric unit, the conduction unit and the levelness regulating portion are located on a same side of the actuating portion. an actuating portion having a first actuating area, a second actuating area, and at least one connecting section between the first actuating area and the second actuating area, wherein the first actuating area is movable with respect to the second actuating area; a piezoelectric unit having a first signal area and a second signal area, wherein the first signal area and the second signal area are provided in a same plane, with an isolating portion provided between the first signal area and the second signal area, and the piezoelectric unit is provided at a position corresponding to the first actuating area of the actuating portion; and a conduction unit comprising a first electrode and a second electrode, wherein the first signal area of the piezoelectric unit is electrically connected to the first electrode of the conduction unit, and the second signal area of the piezoelectric unit is electrically connected to the second electrode of the conduction unit; characterized in that the actuator (100, 100a, 100b, 100c) further comprises a supporting portion, wherein the supporting portion and the piezoelectric unit are located in a same plane, the piezoelectric unit and the supporting portion are located on the same side of the actuating portion, and the supporting portion is provided at a position corresponding to the second actuating area of the actuating portion; and the actuator (100, 100a, 100b, 100c) further comprises a levelness regulating portion, wherein the piezoelectric unit, the conduction unit and the levelness regulating portion are located on a same side of the actuating portion.