Provided is a speaker, including a frame; a vibration unit fixed to the frame; and a magnetic circuit unit driving the vibration unit to vibrate and produce sound and provided with a magnetic gap. The vibration unit includes a diaphragm, a voice coil, and an elastic support assembly; the diaphragm includes a diaphragm body, a diaphragm fixing portion, and a diaphragm supporting portion; the vibration unit further includes a fixing ring; and the elastic support assembly includes an elastic member fixed to a side of the fixing ring close to the diaphragm, and an auxiliary diaphragm provided on a side of the elastic member away from the diaphragm; and the diaphragm supporting portion is fixed to a side of the elastic member away from the fixing ring. With this structure, the overall strength and reliability of the speaker can be improved.