Lenses 11, 12, and 13 having a power are layered in an optical
axis direction such that flange section 11d and 12d are
cemented so as to form an air interval between the lens 11 and the lens
12. A space between the lens 12 and the lens 13 are cemented
together. A preferable interval is disposed in the optical axis direction by a
positioning section which is disposed in each flange section.
By doing this possible to provide a compact image pickup lens unit which can
be
used in an image pickup device having a superior performance by a cheap cost.
