A projection lens system that projects projection light from a light
modulator onto a screen and which is telecentric on an input side is
provided. The projection lens system comprises a first meniscus lens that
is disposed closest to the screen, is convex on a screen side, and has
negative refractive power; and a second meniscus lens that is disposed
next closest to the screen, is convex on a screen side, and has negative
refractive power. The first meniscus lens is made of plastic and at least
one out of two curved surfaces thereof is aspherical, and a refractive
power of the first meniscus lens is lower than a refractive power of the
second meniscus lens. In the projection lens system, far superior
aberration-correcting performance can be achieved and a drop in
aberration-correcting performance due to thermal deformation can be
prevented.