Vehicle steering system

A vehicle steering system, comprising:

• a steering member;
• steered wheels;
• a steered shaft that moves in an axial direction that extends along a lateral direction of a vehicle in response to an operation of the steering member to thereby steer the steered wheels;
• a housing that supports the steered shaft such that the steered shaft is movable in the axial direction;
• a fitting bracket that is formed on the housing and that has a first bolt insertion hole;
• a vehicle body-side member that has a second bolt insertion hole;
• and
• a bolt that is inserted through the first bolt insertion hole and the second bolt insertion hole to fasten the fitting bracket to the vehicle body-side member, wherein;
• one of the first bolt insertion hole and the second bolt insertion hole is a long hole that extends in the lateral direction;
• in an emergency situation where a reverse input equal to or larger than a predetermined value is applied from a road surface to the steered wheels, the bolt is displaced within the long hole in the lateral direction, causing the fitting bracket to displace with respect to the vehicle body-side member in the lateral direction;
• the long hole has a center portion in which the bolt is fitted in a normal situation, and paired emergency position keeping portions that are formed on respective sides of the center portion and used to keep a position of the bolt that has been displaced in the emergency situation;
• the emergency position keeping portions are plastically deformable;
• a width of each of the emergency position keeping portions is smaller than an outer diameter of the bolt;
• and
• an edge portion of the center portion of the long hole is in a curved recess shape such that the bolt is loosely fitted in the center portion.