A speaker (100, 200) comprises: a magnetic circuit (120, 220); a frame (103, 203); a coil (109, 210); a diaphragm (101, 201) having a connector (102, 202) for connecting the diaphragm (101, 201) and the frame (103, 203) so that the diaphragm (101, 201) can oscillate in the up-down direction in relation to the frame; and a cover member (104, 205) connected to one lateral end of the frame (103, 203), the lateral direction being the direction orthogonal to the up-down direction, the cover member being disposed so as to cover the diaphragm (101, 201) from above, and the cover member forming an opening (130, 230) for emitting sound between the two lateral ends of the frame (103, 203). The cover member (104, 205) has, on the closed end side, a spacer (110, 204) for reducing the volume of the space on the closed end side above the diaphragm (101, 201) and below the cover member (104, 205).