Abstract: A folded diaphragm loudspeaker of the type used in the manufacture of audio equipment, includes a first magnetic circuit board having at least one magnet and two pole parts (7) formed from a flexible printed circuit board, where between a folded diaphragm (1) is housed, having folds with a greater cross-section in its most external part with respect to the internal folds, characterised in that the diaphragm (1) is fixed in its entirety to a frame (4), except in one of its ends, where the diaphragm (1) is joined to a rigid support (3) associated with a bowed steel strip or band (2) that tenses the folded diaphragm (1) in the direction of its folds.