An magnetic assembly and an electro-acoustic transducer using the same are disclosed. The magnetic assembly includes a lower plate, a main magnet positioned on a central portion of the lower plate, an auxiliary magnet positioned on a periphery portion of the lower plate, surrounding the main magnet with space, and having an inner surface facing the main magnet and an outer surface opposite to the inner surface, and a first pole plate. The first pole plate includes a base body attached on the auxiliary magnet, and a magnetic conduction member connected with the base body and overlapping the outer surface of the auxiliary magnet for forming a loop of magnetic flux together with the base body and the lower plate as well as the auxiliary magnet.