A projection zoom lens device includes, in order from a magnification side, a negative first group G1 and positive second to fifth groups (G2 to G5) and is configured so that the second group G2, the third group G3, and the fourth group G4 are moved along an optical axis toward the magnification side during zooming from a wide-angle end state to a telephoto end state. Also, a lens L4, being closest to the magnification side, of the second group G2 is formed of a negative lens, and the fifth group G5 includes a single positive lens.