An acoustic equalizer for use in a speaker unit including a central member in the shape of a generally spherical cone and a plurality of annular members arranged coaxially around the central member, the innermost one of which is partially linked through a linking portion to the central member with an annular vacant space between and each adjacent two of which are partially linked through another linking portion to each other with an annular vacant space between, wherein first ring-shaped end portions of the annular members and a first end portion of the central member surrounded with the first ring-shaped end portions of the annular members are provided to form in its entirety a spherical surface portion for facing a diaphragm member of a speaker unit and second ring-shaped end portions of the annular members opposite to the first ring-shaped end portions and a second end portion of the central member opposite to the first end portion and surrounded with the second ring-shaped end portions of the annular members are put an a virtual curved surface extending along the spherical surface portion. The acoustic equalizer contributes to causing a reproduced sound obtained from a speaker unit to be widely dispersed especially in a high frequency range.