107 is positioned in an upper part of the triangle prism 106 as well as in the side surface of the first lens portion 105 the second lens portion 107 is arranged so that a lens central axis 110 is almost parallel to the z axis and so that the center of a light emitting surface of the led 101 corresponds to the vicinity of a fecal position in consideration of an optical path length and the bending of the optical path due to the triangular prism 106 the first lens 105 and the second lens 107 are preferably aspherical for reducing aberration the first lens 105 the triangular prism 106 and the second lens 107 are integrally formed without an interface and are formed of a transparent member such as glass polycarbonate acrylic or the like having the same refractive index the led 101 is arranged in the vicinity of the focal planes of the first lens 105 and the second lens 107 in the above description and more specifically the led 101 is arranged with defocusing so that broadening of emitted light from the first lens 105 and the second lens 107 will be broadening of light having a specified value in an upper and lower direction z axis direction a width of the first lens unit 102 in the x axis direction is a size which is the same as or slightly larger than an.