A paper towel holder comprises a base and a magnetically non-attractive shaft disposed vertically on top of the base. A first magnetically attractive element is disposed on an upper end of the shaft. A pressing member is disposed on the upper end of the shaft, is movable relative to the shaft in a vertical direction, and has a lower side having a pressing face. A second magnetically attractive element is disposed on the pressing member. When the pressing member is secured onto the shaft by magnetic attraction between the first and second magnetically attractive elements, a spacing between the pressing face and the base is smaller than a height of a paper towel roll. When the paper towel roll is disposed on the paper towel holder, the pressing face presses against a top end of the paper towel roll under the magnetic attraction.