Stiffening device

A stiffening device provided between left and right shock absorber support portions which are formed in a part of a vehicle body and on which shock absorber upper end portions of left and right suspension devices are respectively supported, comprising:

• a left side shaft and a right side shaft fixed to the left and right shock absorber support portions, respectively;
• and
• a rotation allowing portion connecting the left side shaft and the right side shaft in a central portion of the vehicle body in a vehicle width direction, and allowing the left side shaft and the right side shaft to rotate,
• wherein a fixing location in which the left side shaft and the right side shaft are fixed to the shock absorber support portions is disposed further toward a vehicle front side than a position of a rod axis of the shock absorber in the vicinity of the shock absorber support portion.