There are provided a first lens unit having negative refractive power, a second lens unit having positive refractive power, a third lens unit having negative refractive power, and fourth, fifth, sixth, and seventh lens units, which are arranged from an enlargement conjugate side toward a reduction conjugate side in this order, the first lens unit includes at least one negative lens and at least one positive lens arranged closer to the reduction conjugate side than the at least one negative lens, the third lens unit is movable from the enlargement conjugate side toward the reduction conjugate side for the zooming, and the refractive index of a lens included in the third lens unit meets a predetermined conditional equation.