To provide a LED headlight structure that visually conveys a modern or stylish appearance to an observer, the LED headlight structure is characterized in that: a headlight PCB(260) low beam and high beam headlight LED structures on at least one side of the motorcycle are mounted to one plate or in one plane such that high beam illumination is emitted at the inside of the motorcycle and low beam illumination is emitted at the outside of the motorcycle; an extension member (120) is positioned forward of the reflector assembly (140) and between a headlight case (104) and a headlight lens (102); and a window structure (122) configured for selectively passing portions of the low and the high beam illumination reflected by the reflector assembly is formed at the extension member (120).