A lens unit, comprising: a plurality of lenses (21∼27) which are arranged in an optical axis direction, the plurality of lenses (21∼27) comprising at least a glass lens; and a lens barrel which holds the plurality of lenses (21∼27), the lens barrel comprising a glass lens holding part which holds the glass lens; wherein the glass lens holding part is a lens holder made of resin which is separately provided from the lens barrel and is accommodated into the lens barrel together with the glass lens; wherein when a face of the lens holder which is on an object side in the optical axis direction is referred to as an object side face and another face of the lens holder which is on an image side is referred to as an image side face, the object side face or the image side face is formed with a plurality of projecting parts which support an adjacent lens which is adjacent to the glass lens on one side; and wherein the plurality of projecting parts is structured as a distance determination part which is configured to adjust and determine a space distance between the glass lens and the adjacent lens; the lens unit being characterized in that the distance determination part which is the projecting part is formed so that a tip end part of the projecting part is heated and crushed to adjust a length of the projecting part in the optical axis direction, and a space is provided between forming positions of the projecting parts and an outer peripheral face of the lens holder in a radial direction of the lens holder for preventing a crushed and protruded portion of the tip end part of the projecting part from contacting with an inner face of the lens barrel. a plurality of lenses (21∼27) which are arranged in an optical axis direction, the plurality of lenses (21∼27) comprising at least a glass lens; and a lens barrel which holds the plurality of lenses (21∼27), the lens barrel comprising a glass lens holding part which holds the glass lens; wherein the glass lens holding part is a lens holder made of resin which is separately provided from the lens barrel and is accommodated into the lens barrel together with the glass lens; wherein when a face of the lens holder which is on an object side in the optical axis direction is referred to as an object side face and another face of the lens holder which is on an image side is referred to as an image side face, the object side face or the image side face is formed with a plurality of projecting parts which support an adjacent lens which is adjacent to the glass lens on one side; and wherein the plurality of projecting parts is structured as a distance determination part which is configured to adjust and determine a space distance between the glass lens and the adjacent lens; the lens unit being characterized in that the distance determination part which is the projecting part is formed so that a tip end part of the projecting part is heated and crushed to adjust a length of the projecting part in the optical axis direction, and a space is provided between forming positions of the projecting parts and an outer peripheral face of the lens holder in a radial direction of the lens holder for preventing a crushed and protruded portion of the tip end part of the projecting part from contacting with an inner face of the lens barrel.