A SIM card holder includes a base (10) and a catching mechanism (20). The base defines a receiving groove (114) and a slot (110). The receiving groove is configured for receiving the SIM card therein. The base comprises a protrusion (108). The protrusion and the slot are arranged at two opposite sides of the receiving groove. The catching mechanism comprises a main board (201) having a bending piece (202) and a bending hem (204) at two opposite ends thereof. The bending piece is detachably engaged with the base, and the bending hem is constantly retained in the slot of the base. The main board comprises an elastic slice resisting the protrusion of the base when the bending piece being engaged with the base. The catching mechanism is movable relative to the base and rotatable about the end of the bending hem when the slice disengages from the protrusion.