To reduce the number of transmission systems of the force from a steering wheel to steered wheel in a steering device for a vehicle.

A worm wheel (output gear) of a gear box 20 is integrally provided with a piston rod of one side shock absorber of struts ST (suspension constitution bodies) respectively rotating around each king pin shaft KP. The rotation of the steering wheel A is transmitted to the struts ST through the gear box 20 from the first transmission system, the king pin shaft KP is rotated by the rotation of the struts ST, and a right steered wheel WFR is directly steered. The movement of the right steered wheel WFR is transmitted to a left steered wheel WFL through a second transmission system 60, and the left steered wheel WFL is steered.