A thin and cost-effective bi-directional loudspeaker which can reproduce high quality sound toward contrary directions simultaneously, arranged from bottom to the top, consists of a frame (2), a U-yoke (3), a first magnet (4), a washer (5), a copper cap (6), a second magnet (7), a voice coil (8), a diaphragm (9), a spacer (12), a spider (15), a dust cap (18) and a connector (1) disposed on lateral side of the frame (2). Said loudspeaker is characterized in that: said diaphragm (9) is in a cone shape whose an inner edge (10) of said apex is fixed with top of said voice coil (8). A periphery (16) of the spider (15) is fixed with an upper edge (14) of the supporting ring (12) and a bottom edge (13) thereof is fixed with an exterior (11) of the diaphragm (9). Said spider (15), spacer (12) and diaphragm (9) are coupled by adhesive and fixed on top of said frame (2).
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