Abstract: An improved rearview mirror structure mainly includes a support bar, a mirror frame and an anchor post. The support bar has a chute formed on a front end and at least one anchor rack on a rear end. The mirror frame has a sliding strut housed in the chute. The anchor rack is coupled on the anchor support and may be anchored thereon by turning a first adjust bolt. The mirror frame is anchored and adjustable upwards and downwards, and to the left and the right to reach a desired elevation. Thus the rearview scope may be expanded without producing any dead angle to achieve driving safety.