The present disclosure relates to a slim acoustic transducer having a thin thickness a low-frequency reproduction capability and a sound pressure level in the entire frequency band of which may not be lowered. A slim acoustic transducer includes a diaphragm; a voice coil disposed at a peripheral portion of the diaphragm; and a permanent magnet disposed around the voice coil and configured to apply a magnetic field to the voice coil, wherein a maximum amplitude of the diaphragm is less than a thickness of the permanent magnet.