<p>Provided is a speaker device having an acoustic radiation performance near to indirectivity. The speaker device includes: a still unit (2) and an oscillation unit (3) which is directly or indirectly supported by the still unit (2) in such a manner that the oscillation unit (3) can be oscillated. The still unit (2) has a magnetic circuit (20) for forming a magnetic gap (20G). The oscillation unit (3) has: a diaphragm (11) whose outer circumferential portion (11A) is supported; and a voice coil (10) formed in an annular shape along the outer circumferential potion (11A) and arranged in the magnetic gap (20G) for oscillating the outer circumferential portion (11A) of the diaphragm (11). The diaphragm (11) is oscillated by expansion/contraction-oscillating the voice coil (10) in the radial direction of the annular shape.</p>
