Projector type headlight

A projector type headlight comprising:

• a projection lens which is arranged on an optical axis, the optical axis extending in a longitudinal direction of a vehicle, and the projection lens including a focal plane;
• and
• a light source unit which is arranged at a more rear side than a back side of the focal plane of the projection lens,
• wherein the projection lens includes three resin lenses which are arranged on the optical axis,
• the light source unit includes a light source and is configured so as to form a light source image that is emitted forward through the three resin lenses and forms a light distribution pattern including a boundary line between light and shade, substantially on the back side of the focal plane of the projection lens,
• a first resin lens which is arranged most distant from the light source and a third resin lens which is arranged closest to the light source out of the three resin lenses each has a positive power,
• a second resin lens out of the three resin lenses is arranged between the first resin lens and the third resin lens and includes a diffraction grating provided on a lens face in a side opposite to the light source, and
• the diffraction grating is designed so as to cancel chromatic aberration of light which is emitted from the light source unit and is emitted forward through the three resin lenses, wherein the second resin lens has a wall thickness thinner than a wall thickness of each of the first resin lens and the third resin lens, respectively.