A projection headlight for a vehicle, comprising a reflecting mirror having a mounting space that is defined by a first reflective surface unit; a light shield disposed in said mounting space and including a second reflective surface unit facing rearwardly; a lens disposed in front of said reflecting mirror and said light shield, a reflector disposed in said mounting space, disposed behind said light shield and including a third reflective surface unit facing toward said second reflective surface unit; and a light emitting unit disposed in said mounting space, disposed behind said light shield, and emitting a light beam that is reflected by said first reflective surface unit toward said second reflective surface unit, and that is then reflected by said second reflective surface unit toward said third reflective surface unit to be projected forwardly through said lens, said projection headlight characterized by: said second reflective surface unit of said light shield is formed with a plurality of light distributing surface portions arranged side-by-side in a transverse direction transverse to a front-rear direction in which said lens is spaced apart from said reflecting mirror, and configured to distribute light emitted from said light emitting unit in the transverse direction, each of said light distributing surface portions being one of a rearward-facing curved surface that is rearwardly convex and a rearward-facing curved surface that is forwardly concave; said third reflective surface unit of said reflector is formed with a plurality of light distributing structures arranged side-by-side in the transverse direction and configured to distribute light emitted from said light emitting unit in the transverse direction, each of said light distributing structures being one of a forward-facing curved surface that is rearwardly concave and a forward-facing curved surface that is forwardly convex. a reflecting mirror having a mounting space that is defined by a first reflective surface unit; a light shield disposed in said mounting space and including a second reflective surface unit facing rearwardly; a lens disposed in front of said reflecting mirror and said light shield, a reflector disposed in said mounting space, disposed behind said light shield and including a third reflective surface unit facing toward said second reflective surface unit; and a light emitting unit disposed in said mounting space, disposed behind said light shield, and emitting a light beam that is reflected by said first reflective surface unit toward said second reflective surface unit, and that is then reflected by said second reflective surface unit toward said third reflective surface unit to be projected forwardly through said lens, said projection headlight characterized by: said second reflective surface unit of said light shield is formed with a plurality of light distributing surface portions arranged side-by-side in a transverse direction transverse to a front-rear direction in which said lens is spaced apart from said reflecting mirror, and configured to distribute light emitted from said light emitting unit in the transverse direction, each of said light distributing surface portions being one of a rearward-facing curved surface that is rearwardly convex and a rearward-facing curved surface that is forwardly concave; said third reflective surface unit of said reflector is formed with a plurality of light distributing structures arranged side-by-side in the transverse direction and configured to distribute light emitted from said light emitting unit in the transverse direction, each of said light distributing structures being one of a forward-facing curved surface that is rearwardly concave and a forward-facing curved surface that is forwardly convex. said second reflective surface unit of said light shield is formed with a plurality of light distributing surface portions arranged side-by-side in a transverse direction transverse to a front-rear direction in which said lens is spaced apart from said reflecting mirror, and configured to distribute light emitted from said light emitting unit in the transverse direction, each of said light distributing surface portions being one of a rearward-facing curved surface that is rearwardly convex and a rearward-facing curved surface that is forwardly concave; said third reflective surface unit of said reflector is formed with a plurality of light distributing structures arranged side-by-side in the transverse direction and configured to distribute light emitted from said light emitting unit in the transverse direction, each of said light distributing structures being one of a forward-facing curved surface that is rearwardly concave and a forward-facing curved surface that is forwardly convex.