Projection zoom lens and projection device

A projection zoom lens is configured by a first group having a negative refractive force, a second group having a positive refractive force, a third group having a positive refractive force, an aperture diaphragm, a fourth group having a positive refractive force, and a fifth group having a positive refractive force,

• wherein the groups are arranged in aforementioned order from an enlarged-side to a reduced-side in the projection zoom lens,
• wherein the reduced-side is telecentric,
• wherein the first group is configured by
• a first sub-lens group having a positive or a negative refractive force,
• a second sub-lens group having a negative refractive force, and
• a third sub-lens group having a negative refractive force,
• wherein the sub-lens groups are arranged sequentially from the enlarged-side to form a focusing group,
• wherein the second group to the fifth group constitute a zooming group,
• wherein the focusing group changes a spacing of a group adjacent to the first sub-lens group to the third sub-lens group when changing focus from an infinite distance to a near distance, and
• wherein the zooming group is configured by at least the second group to the fourth group, each of the second group to the fourth group is moved independently to the enlarged-side when magnifying from a wide-angle end to a telephoto end, thereby performing zooming.