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 hem is engaged in the slot. The bending piece is engagable with the base so as to lock the SIM card in the receiving groove. The main board comprises an elastic slice resisting the protrusion when the bending piece is engaged with the base.