To obtain a joy stick device having such a constitution that an unintended rotation of a knob is prevented against a tilt operation of a control lever, an option device such as a switch, etc., can be arranged at a head part of a control lever and a harness of an option device is never twisted.

The rotation of a lever shaft 30 is regulated by the engagement secured between a slit 42a of a 1st coupling plate 42 and a 1st engagement part of the shaft 30. A grip 70 that is held for operation of the control lever is unified with the head part of the shaft 30. The grip 70 has an option placement space 70a, and a groove 30d is vertically formed between the upper and lower ends of the shaft 30. A knob member 81 of a knob 18 is rotatively attached to the shaft 30 at a part under the grip 70. Then a potentiometer 85 is provided between the member 81 and a lower member 82 whose rotation is regulated to the shaft 30.