An elastically deformable suspension member for use in a speaker to establish a sufficient support to a cone is disclosed. The suspension member has an inner diameter portion for mounting the cone, an outer diameter portion spaced around the inner diameter portion for fastening to a basket, a first annular convex surface portion concentrically arranged between the inner diameter portion and the outer diameter portion and constituting a summit, and a number of second annular convex surface portions symmetrically arranged at two opposite lateral sides of the first annular convex surface portion between the inner diameter portion and the outer diameter portion and respectively constituting summit ridges having a height below the summit and above the elevations of the inner diameter portion and the outer diameter portion.