| 主权项 |
1. A lens unit comprising:
a plurality of lenses; a lens holder which holds the plurality of the lenses; and a circular ring-shaped sealing member made of rubber; wherein a first lens of the plurality of lenses is disposed closest to an object side and is a plastic lens, the first lens being formed with a small diameter part whose outer diameter is set to be smaller in a step shape on an image side of the first lens; wherein a sealing member accommodation part, which is a space in which the sealing member is disposed, is provided between an outer peripheral face of the small diameter part and an opposed face which is an inner peripheral face of the lens holder that faces the outer peripheral face of the small diameter part; wherein the sealing member accommodation part accommodates the sealing member so as to have clearance in an optical axis direction; and wherein an inner face of the lens holder for defining the sealing member accommodation part is formed with a sealing member coming-off prevention part which is projected to the sealing member accommodation part to narrow the clearance on the image side of the sealing member accommodation part and thereby movement to the image side of the sealing member is restricted. |
