Provided is a speaker, including a frame; a vibration unit; and a magnetic circuit unit. The magnetic circuit unit is provided with a magnetic gap; the vibration unit includes a diaphragm, and a voice coil; the magnetic circuit unit includes a yoke, a main magnet unit, and auxiliary magnet units, and the auxiliary magnet units and the main magnet unit define the magnetic gap; the vibration unit further includes two elastic support assemblies; each of which includes an elastic member and an auxiliary diaphragm; the elastic member includes a first fixing arm, a second fixing arm and an elastic arm; the auxiliary diaphragm includes an auxiliary suspension, and a first connecting portion and a second connecting portion; and the auxiliary suspension has a racetrack shape with notches. With this structure, the service life and reliability of the speaker are improved.