A voice coil motor. At least one guide bar is connected to a fixed base. A coil is connected to the fixed base. A support base is movably fit on the guide bar. An annular magnetic member is connected to the support base and surrounded by the coil. A magnetization direction of the annular magnetic member parallels a moving direction of the support base and annular magnetic member. The annular magnetic member includes a first magnetic pole and a second magnetic pole. The first magnetic pole is disposed in the coil and separated from the bottom thereof. The second magnetic pole is disposed outside the coil. The coil interacts with the annular magnetic member to generate a first force, driving the support base and annular magnetic member to move along the magnetization direction of the annular magnetic member.