A joystick (1) comprising a substantially stationary part (4) and a movable part (3) adapted to be manipulated by an operator. The joystick further comprises a sensor device adapted to detect a position of the movable part (3) relatively to the substantially stationary part (4), the sensor device comprising a magnet arrangement comprising one or more magnets (9) and defining a predetermined magnetic field, and a magnetic detector being adapted to detect a magnetic flux and to generate a corresponding output. The magnet arrangement or the magnetic detector is arranged on the substantially stationary part (4), while the magnetic detector or the magnet arrangement is arranged on the movable part (3). Thereby relative movements between the parts (3, 4) result in relative movements between the magnet arrangement and the magnetic detector. The magnet(s) (9) of the magnet arrangement is/are shaped in such a manner that an outer contour of the magnet(s) (9) substantially follows a relative angular movement between the magnet(s) (9) and the magnetic detector during manipulation of the movable part (3). Thereby a substantially linear change in output from the magnetic detector is obtained in response to a linear change in the relative position between the parts (3, 4). The magnetic detector preferably is or comprises a Hall effect sensor (10). The magnet(s) (9) may have a curved shape, e.g. a ‘banana like’ shape.