A runway-embedded flash lighting device, comprising: a cylindrical body; a ceiling member; a bottom cover member; a light guide member; an LED flash light source; and a heat conducting member, wherein the cylindrical body is suitable for being embedded in a runway, the ceiling member is placed in an upper opening of the cylindrical body in a state of being able to be exposed to a runway surface when the cylindrical body is embedded in the runway, wherein the ceiling member has a stepped structure that includes an upper ceiling portion and a lower ceiling portion, and is provided with a flash emission window, and the upper ceiling portion is placed on the rear side relative to the emission direction of the flash emission window, and the lower ceiling portion is placed on the emission direction side of the flash emission window, and the flash emission window and the light guide member are divided into two or more by a reinforcing plate member, and the reinforcing plate member is placed on the outer surface of the lower ceiling portion in a state of standing upright in the vertical direction of the outer surface of the lower ceiling portion, the bottom cover member is placed in a state of closing the lower opening of the body, the light guide member is placed in the flash emission window, the LED flash light source is placed inside the cylindrical body in a state - capable of emitting flash toward the light guide member placed in the flash emission window, the light guide member allows flash emitted from the LED flash light source to be emitted to an outside from the flash emission window, the heat conducting member is placed inside the cylindrical body, a part of the heat conducting member is in contact with the LED flash light source, and at least a part of a rest of the heat conducting member is in contact with the ceiling member, wherein the heat conducting member comprises a plate-like heat sink and a heat pipe, a part of one surface of the plate-like heat sink is in contact with the LED flash light source, at least a part of a rest of the one surface of the plate-like heat sink is in contact with the lower ceiling portion, and the heat pipe is attached to the plate-like heat sink in a state where one end side of which is located on an LED flash light source side and the other end side is located on a lower ceiling portion side. a cylindrical body; a ceiling member; a bottom cover member; a light guide member; an LED flash light source; and a heat conducting member, the cylindrical body is suitable for being embedded in a runway, the ceiling member is placed in an upper opening of the cylindrical body in a state of being able to be exposed to a runway surface when the cylindrical body is embedded in the runway, wherein the ceiling member has a stepped structure that includes an upper ceiling portion and a lower ceiling portion, and is provided with a flash emission window, and the upper ceiling portion is placed on the rear side relative to the emission direction of the flash emission window, and the lower ceiling portion is placed on the emission direction side of the flash emission window, and the flash emission window and the light guide member are divided into two or more by a reinforcing plate member, and the reinforcing plate member is placed on the outer surface of the lower ceiling portion in a state of standing upright in the vertical direction of the outer surface of the lower ceiling portion, the bottom cover member is placed in a state of closing the lower opening of the body, the light guide member is placed in the flash emission window, the LED flash light source is placed inside the cylindrical body in a state - capable of emitting flash toward the light guide member placed in the flash emission window, the light guide member allows flash emitted from the LED flash light source to be emitted to an outside from the flash emission window, the heat conducting member is placed inside the cylindrical body, a part of the heat conducting member is in contact with the LED flash light source, and at least a part of a rest of the heat conducting member is in contact with the ceiling member, wherein the heat conducting member comprises a plate-like heat sink and a heat pipe, a part of one surface of the plate-like heat sink is in contact with the LED flash light source, at least a part of a rest of the one surface of the plate-like heat sink is in contact with the lower ceiling portion, and the heat pipe is attached to the plate-like heat sink in a state where one end side of which is located on an LED flash light source side and the other end side is located on a lower ceiling portion side.