PURPOSE: To securely perform a steering lock by locking a link of a steering device of an independent suspension axle with a chassis.

CONSTITUTION: In a center arm link type independent suspension steering device, a pin insertion hole 6 is provided in a center arm 3, and a steering lock pin 4, which can be moved in the axial direction by a cylinder 5, is fitted to a bracket 8. At the time of operating a steering lock switch for lock, fluid pressure is applied to the bottom side of the cylinder 5 to move a piston rod forward, and a steering lock pin 4 is fitted in the pin insertion hole of the center arm 3. The center arm 3, which has been axially rotated around the pin 9, is fixed to the bracket 8 integrated with a chassis, and a knuckle arm connected to a tie-rod as a rigid body is fixed to obtain the steering lock condition.