To provide a projection lens configured so as to facilitate adjustment of lens eccentricity.
The projection lens 1 has a lens frame 7 that has a holding portion 71 holding a lens, and cam pins 72 projecting from the circumference of the holding part 71 in an optical axis orthogonal direction, that is, the direction substantially perpendicular to the optical axis, and having recesses 724 formed in their leading ends; and a cam cylinder 4 in which the optical axis is set and has in its internal face cam grooves 42, which are engaged with the cam pins 72. Each cam pin 72 is configured so that an amount that the cam pin 72 projects to the holding part 71 can be changed. The cam groove 42 has a through-hole 42C from which the recess 724 is exposed, and an inclining surface 420 that abuts on the cam pin 72 in the optical axis orthogonal direction.
SATO HIDETOSHI
Osamu Suzawa
Kazuhiko Miyasaka