Steering controller of vehicle

A steering control device for a vehicle comprising:

• a housing;
• a first input shaft;
• a hollow second input shaft;
• an output shaft supported by the housing in a state to allow the output shaft to rotate around an axis thereof and limit a linear motion in the axial direction and having a center line aligned on substantially the same straight line on which a center line of the second input shaft is aligned, said output shaft being formed with a screw at an outer peripheral surface thereof;
• a nut mounted to the output shaft;
• a spline mechanism for the first input shaft for rotating the nut in accordance with the rotational motion of the first input shaft and linearly moving the nut in the axial direction with respect to the first input shaft;
• a hollow thrust transmission member fitted into the second input shaft and formed, at an outer peripheral surface thereof, with a thread;
• and
• another spine mechanism for the thrust transmission member fixed to the housing and adapted to guide the linear motion of the thrust transmission member in the axial direction thereof,
• wherein the nut disposed inside the thrust transmission member is moved linearly in the axial direction of the thrust transmission member together therewith and rotated around the axis of the thrust transmission member.