Driver for horn speaker

The present invention relates to a driver for a horn speaker, and more specifically, to a driver for a horn speaker, which is capable of improving an output and sound quality of a speaker and reducing heat generated from dissipation of acoustic signals by transferring an acoustic signal propagated to a rear part through a diaphragm and synthesizing the propagated acoustic signal with an acoustic signal propagated to a front part. The driver for a horn speaker comprises: an external cover having a front cover and a rear cover; an internal cover provided in the external cover; a diaphragm disposed at a portion inside the internal cover; a voice coil provided under the diaphragm; a ring-shaped permanent magnet provided at a lower portion of an edge of the diaphragm; and a pole piece provided under the permanent magnet and having a through-hole at the center.