VIBRATION MOTOR

The invention provides a vibration motor which comprises a base; a housing, fixed to the base in a circumferential portion; a shaft, lower end of which is fixed on the base and upper end is fixed to a top surface; a rotor magnet having a opening at center and surrounding the shaft; an armature axially opposed to the rotor magnet via a clearance; back yoke, contacting with upper surface of the rotor magnet and extending along radial direction, having a opening at center; a eccentric weight; and a holder, for holding the back yoke and the eccentri weight; the back yoke is provided with a overhang portion. the holder is provided with a penetrated portion positioned at an axially inner side of the rotor magnet and extends in the axial direction surrounding the shaft; the holder has an upper surface portion which expands radially outwardly from an upper side of the penetrated portion to cover at least part of an upper surface of the eccentric weight, and a lower surface portion which expands radially outwardly from the lower side of the penetrated portion to cover at least part of the lower surface of the overhang portion. The shaft supports the holder with the penetrated portion to rotate.