Lens unit having glass lens, resin lenses, and reflection preventing film

A lens unit comprising a plurality of lenses arranged side by side with optical axes thereof aligned with each other,

• wherein the lenses include a glass lens and more than one resin lens, a lens closest to an object is the glass lens, the resin lenses are accommodated inside a lens barrel, and except for the glass lens, each lens is provided with a high temperature resistant reflection preventing film,
• wherein the high temperature resistant reflection preventing film comprises a plurality of inorganic particles, air layers, and binder that is at least one of organic compound, inorganic compound, and inorganic polymer,
• wherein the more than one resin lens includes a combined lens comprised of at least two resin lenses bonded to each other, wherein the high temperature resistant reflection preventing film is provided only on an outer surface of the combined lens and is not provided between the bonded resin lenses, and wherein the combined lens is the resin lens furthest from the glass lens,
• the inorganic particles have a volume ratio of 5-74% in the high temperature resistant reflection preventing film,
• the air layers are formed between the inorganic particles adjacent to each other and have a volume ratio so as to be present but no more than 65%,
• the binder binds together the inorganic particles or the inorganic particles and the air layers, has a lower Young's modulus than the inorganic particles, and has a volume ratio of 5-95%, and
• wherein the lens barrel has an inner peripheral surface when viewed from the optical axis direction, and wherein the inner peripheral surface of the lens barrel forms a plurality of point contacts with the high temperature resistant reflection preventing films of the resin lenses.