Actuating device of automatic shift transmission

The invention relates to an actuating device (10) for an automated gearshift transmission (12) of a motor vehicle, by means of which a selection or shift element of the gearshift transmission can be moved in order to set a shift slot or to engage or disengage a transmission gear, said actuating device comprising an actuator (54) driven by a pressure medium, the invention relates to an actuating device for a shift transmission, comprising a piston (58) and a piston rod (64) which can be connected to a selection or shift element of the shift transmission, the piston being arranged radially hermetically in a cylinder-type receiving space (50) of a housing (18) of the actuating device and being movable coaxially there, a sensor system (30) having a magnet (38) and a magnetic field-sensitive sensor (32) being provided, and the sensor system (30) being arranged in the cylinder-type receiving space (50) of the housing (18) of the actuating device. The magnet is arranged on the piston on the end side facing away from