Abstract: A cup holder of the invention includes a slider slidably situated in a housing, an arm pivotally attached to a lower side of the slider so that when the slider is pulled from the housing into a using position, a front portion of the arm descends, a supporting member pivotally attached to the front portion of the arm, at least one holding arm rotatably attached to the slider, and a link mechanism. The holding arm has a holding portion laterally rotated to form an inserting portion between the holding portion and the slider when the slider is moved to the using position, and a first pressing portion for rotating the holding portion in a direction away from the slider when the first pressing portion is pressed. The link mechanism is rotatably attached to the arm and has a second pressing portion in a rear portion. The second pressing portion moves forward along a movement of the slider to press the first pressing portion to force the holding portion to rotate in the direction away from the slider.