Projection zoom lens system and projection type display apparatus

A projection zoom lens comprising, in order from a magnification side thereof:

• a first lens group having a negative refractive power;
• a second lens group having a positive refractive power;
• a third lens group having a positive refractive power;
• a fourth lens group having a positive refractive power;
• and
• a fifth lens group having a positive refractive power;
• wherein the first lens group includes a first lens of an aspherical lens whose concave surface is directed to a reduction side of the projection zoom lens,
• the second lens group includes a second lens of a positive lens,
• the third lens group includes, in order from the magnification side, a third lens of a positive lens and a fourth lens of a negative lens,
• the fourth lens group includes, in order from the magnification side, a fifth lens of an aspherical lens whose concave surface is directed to the magnification side, a sixth lens of a negative lens, a seventh lens of a positive lens and an eighth lens of a positive lens,
• the fifth lens group includes a ninth lens of a positive lens, and
• the projection zoom lens is telecentric on the reduction side thereof.