The present application relates to an actuating device (1) having a drive part (2) moving an output part (5) from an initial position into a final position, wherein the output part (5), or the drive part (2), has a first region (9) and a second region (10), and the drive part (2), or the output part (5), interacts with the two regions (9, 10) such that the position of the output part (5) is changed during an interaction with the first region (9), and an interaction with the second region (10) prevents a return movement of the output part (5) into the initial position. The present invention further relates to a vehicle seat comprising the actuating device (1) according to the application.