A supporting mechanism for adjusting an angle of an electronic device, includes a retaining member and a supporting member slidably attached to the retaining member. The supporting member includes a first supporting end and a second supporting end opposite to the first supporting end. The first supporting end is located on a first side of the retaining member, and the second supporting end is located on a second side of the retaining member. The supporting member is slidable relative to the retaining member between a first position and a second position, the first supporting end supports the electronic device in a first position, the second supporting end supports the electronic device in a second position, and both the first and second supporting ends cooperatively support the electronic device in a third position.