A speaker (1, 101, 201, 301) comprising: a vibration part that includes a diaphragm having a tapering portion and a voice coil; a magnetic circuit part configured to apply a magnetic field to the voice coil; and a supporting body configured to support the vibration part and the magnetic circuit part, wherein the supporting body includes a cover member configured to cover the vibration part from one of vibration directions of the vibration part and including a cover tapering portion that faces the tapering portion of the diaphragm and that is inclined in a same direction as the tapering portion of the diaphragm, and a duct configured to cause a space between the vibration part and the cover member to communicate with outside space situated outward of the cover member, wherein an air flow path (16, 116, 216) is formed which communicates with an inside of the duct, wherein the cover member is such that a part of a region thereof configured to cover the vibration part has a recessed portion recessed in a direction away from the vibration part and an inside of the recessed portion is configured to function as the air flow path where an interval between the vibration part and the cover member in the vibration directions is wider than an interval between the vibration part and the cover tapering portion in the vibration directions, and wherein a circuit part provided on an outer side of the cover member and a heat sink that has at least a part thereof exposed in the air flow path are connected to each other to allow heat conduction; characterised in that the air flow path is formed along an arc locus formed around a central axis of the vibration part. a vibration part that includes a diaphragm having a tapering portion and a voice coil; a magnetic circuit part configured to apply a magnetic field to the voice coil; and a supporting body configured to support the vibration part and the magnetic circuit part, wherein the supporting body includes a cover member configured to cover the vibration part from one of vibration directions of the vibration part and including a cover tapering portion that faces the tapering portion of the diaphragm and that is inclined in a same direction as the tapering portion of the diaphragm, and a duct configured to cause a space between the vibration part and the cover member to communicate with outside space situated outward of the cover member, wherein an air flow path (16, 116, 216) is formed which communicates with an inside of the duct, wherein the cover member is such that a part of a region thereof configured to cover the vibration part has a recessed portion recessed in a direction away from the vibration part and an inside of the recessed portion is configured to function as the air flow path where an interval between the vibration part and the cover member in the vibration directions is wider than an interval between the vibration part and the cover tapering portion in the vibration directions, and wherein a circuit part provided on an outer side of the cover member and a heat sink that has at least a part thereof exposed in the air flow path are connected to each other to allow heat conduction; characterised in that the air flow path is formed along an arc locus formed around a central axis of the vibration part.