A diaphragm and suspension edge includes inner and suspension edge portions. The inner suspension edge portion includes an inner suspension edge body, and one or more inner side elastic ribs protruding relative to the inner suspension edge body. Each inner side elastic rib forms a bulge on a first side of the inner suspension edge portion, and forms a flute on the opposite side. The outer suspension edge portion includes an outer suspension edge body, and one or more outer side elastic ribs protruding relative to the outer suspension edge body. Each outer side elastic rib forms a protrusion on a first side of the outer suspension edge portion, and forms a groove on the opposite side. The suspension edge restricts the displacement direction of the vibration unit of a speaker in the axial vibration direction thereof to prevent offset of the vibration unit.