To surely stabilize vehicle behavior.

The vehicle behavior stabilizing control device is equipped with an automatic deceleration control means 34 which automatically decelerates the vehicle by applying the braking force to the wheel to such an extent that the vehicle behavior may not exceed the limit state when the vehicle behavior reaches the limit state. When it is determined that the vehicle is in an under steering state of not less than the predetermined limit during automatic deceleration, the automatic deceleration control means 34 controls the braking of the wheel by the rapid deceleration mode where the vehicle is decelerated most rapidly.