Provided is a speaker driver. The speaker driver includes a pair of yoke members that is arranged to face each other so as to have empty spaces provided on inner sides thereof and fixed to a stand base, two or more magnets that are mounted on inner side surfaces of the yoke members, and a rotating member that is provided with a voice coil disposed in parallel in a direction facing the magnet and disposed between the yoke members, and has one end rotatably coupled to the yoke members and the other end provided with a diaphragm coupling part to which a diaphragm is coupled.