A rear monitor mounting structure may include an armrest having a recess formed in an upper portion and an armrest hinge portion provided on one end thereof, a rear monitor mount provided in the one end of the armrest and pivotally coupled to the armrest hinge portion of the armrest, a vertical rotary motor fixed to the armrest hinge portion and coupled to the rear monitor mount to selectively rotate the rear monitor mount, wherein the vertical rotary motor is co-axially aligned with an armrest hinge shaft pivotally coupling the armrest and a center console, and a rear monitor connected to the rear monitor mount, wherein the rear monitor rotates toward or away from the recess according to a rotation angle of the rear monitor mount with respect to the armrest hinge shaft.