An operating device is, while in use, connected to an image processor which generates image data of an image to be displayed on a monitor on the basis of a program. The operating device is provided with an analog joystick in addition to a plurality of switches, and outputs operation signals by which the image data can be modified according to an operation by an operator. The analog joystick includes a lever having a tip end which is protruded from a housing and inclined in an arbitrary direction including North, South, East and West. There is provided with a guide ring which includes a guide wall having an octagonal outer edge around the lever, and the guide wall guides the lever to eight corners, that is, upper, lower, left, right, right-upper, right-lower, left-upper and left-lower corners.