The invention provides a cup holder and a vehicle employing the same. The cup holder comprises a body structure, a regulating mechanism and a clamping structure, wherein the regulating mechanism is positioned on the lower side of the body structure; the clamping mechanism is positioned on the outer side of an upper area of the body structure; the body structure comprises at least two symmetric arc-shaped cup holder arms; a rack is arranged at the bottom of each arc-shaped cup holder arm; the regulating mechanism comprises a supporting tray; the supporting tray and the arc-shaped cup holder arms constitute a holding space of the cup holder together; a supporting column is arranged at the bottom of the supporting tray and is sleeved by a gear; the gear is occluded with the racks and can drive the rack to move, so that the body structure is movably connected with the regulating mechanism; the clamping structure is used for limiting the movement displacement of the racks. According to the cup holder and the vehicle employing the same, the problem of low practicality caused by the fact that the diameter of the cup holder is immutable in the prior art is solved.