To keep a grip angle constantly all the time, to increase the precision of maneuvering performance, to improve operating preciseness, by arranging a turnable grip in an operating tool main body, and retaining a grip in the position of a reference original point on a base mount, to measure the tilt angle of a connecting rod.

An operating tool main body 6 is provided on the upper end of a connecting tool 5 composed of connecting rods 3 and 4 supported on a base mount 2 in a steering input device 1, and a turnable grip 7 is arranged in the operating tool main body 6. A retaining means 9 retained in the position of a grip reference original point O, and a tilt measuring means 13 for measuring the tilt of the connecting rod 3, are provided on the mount 2. The connecting tool 5 is formed wherein the front and rear connecting rods 3 and 4 are triangularly arranged on the front and the rear row sides respectively. This can retain the tilted angle of a grip constantly, thereby easily and correctly operate turn by a grip at the time of turning movement.