Abstract: An in-line skate with a shock-absorbing device has a boot and a chassis attached under the boot. The chassis has a wheel frame, multiple wheels, a rear wheel bracket and a shock-absorbing device. The wheel frame has a middle and a rear end. The rear wheel bracket is pivotally attached to the middle of the wheel frame and extends toward the rear end of the wheel frame. The shock-absorbing device obliquely and pivotally attaches the wheel frame and the rear wheel bracket. Thereby, the shock-absorbing device significantly reduces vertical and horizontal vibrations and shocks by damping the rear wheel bracket with the shock-absorbing device. Since the pivoting rear wheel bracket has a length much shorter than a conventional pivoting wheel mount and is essentially a moment arm with regard to applied shock, the in-line skate is much more stable than a conventional in-line skate.