An LED flash light source for a runway-embedded flash lighting device, includes an LED module; a frame-shaped attaching plate; a lens member; and a shock-absorbing sheet, wherein the lens member is attached to a hollow portion in a frame of the frame-shaped attaching plate, the lens member is configured to allow an emission surface of a flash emitted from the LED module to have a uniform illuminance distribution, the shock-absorbing sheet includes: a lower shock-absorbing sheet; and an upper shock-absorbing sheet, the lower shock-absorbing sheet is disposed on the LED module, the frame-shaped attaching plate to which the lens member is attached is disposed on the lower shock-absorbing sheet, and the upper shock-absorbing sheet is disposed on the frame-shaped attaching plate.