A vibration motor includes a fixed member, a vibration unit, and an elastic member. The fixed member includes a housing having a receiving space and a coil received in the receiving space and assembled with the housing. The vibration unit includes a first weight, a second weight, and a magnet sandwiched by the first and second weights. The motor further includes a positioning guiding member including a first weight guiding rail formed on the first weight, a base guiding rail formed on the bottom wall of the base, a movement rail formed cooperatively formed by the first weight guiding rail and the base guiding rail, and a plurality of rolling members received in the movement rail for restricting the vibration unit to move along the movement rail.