provided is a projection lens , including : a plurality of moving lens units that move on an optical axis for zooming ; and a plurality of plastic lenses containing plastic , in which when a focal distance of an i - th positive lens from a predetermined plane side of n positive lenses of the plurality of plastic lenses is given by fpi , a focal distance of a j - th negative lens from the predetermined plane side of m negative lenses of the plurality of plastic lenses is given by fnj , and fp and fn are defined by 1 fp = ∑ i = 1 n ⁢ 1 fpi 1 fn = ∑ j = 1 m ⁢ 1 fnj , − 0 . 56 & lt ; fn / fp & lt ;− 0 . 05 is satisfied .