A speaker includes a magnetic circuit forming a slit-like magnetic gap, a frame that houses and holds the magnetic circuit, a diaphragm attached to the frame so as to be capable of vibrating, a voice coil unit that is placed so as to pass through substantially the center of the magnetic gap, and has its one end coupled to the diaphragm, and a damper attached to the frame to support the other end of the voice coil unit. The voice coil unit has a planar-type coil bobbin section, and a voice coil section having a coil member wound in a planar track shape and disposed so as to extend through the coil bobbin section from one side to the other side and from the other side to the one side.