A zoom lens, comprising, in order from an object side: a first lens unit having positive refractive power which does not move for varying magnification; a magnification-varying lens unit (U2, U3) including at least two lens units which move for varying magnification; an aperture stop; and an imaging lens unit having positive refractive power which does not move for varying magnification, wherein: the at least two lens units of the magnification-varying lens unit include, in order from the object side, a second lens unit having negative refractive power which moves in an optical axis direction during varying magnification and a third lens unit which moves in the optical axis direction during varying magnification; the first lens unit is composed of, in order from the object side, a first sub-lens unit having positive refractive power, a second sub-lens unit having negative refractive power, and a third sub-lens unit having positive refractive power; the second sub-lens unit is driven to the object side so as to perform focus adjustment to an object at a short distance; and 0.07 < f 1 / f 11 < 0.35, where f1 represents a focal length of the first lens unit, and f11 represents a focal length of the first sub-lens unit. a first lens unit having positive refractive power which does not move for varying magnification; a magnification-varying lens unit (U2, U3) including at least two lens units which move for varying magnification; an aperture stop; and an imaging lens unit having positive refractive power which does not move for varying magnification, wherein: the at least two lens units of the magnification-varying lens unit include, in order from the object side, a second lens unit having negative refractive power which moves in an optical axis direction during varying magnification and a third lens unit which moves in the optical axis direction during varying magnification; the first lens unit is composed of, in order from the object side, a first sub-lens unit having positive refractive power, a second sub-lens unit having negative refractive power, and a third sub-lens unit having positive refractive power; the second sub-lens unit is driven to the object side so as to perform focus adjustment to an object at a short distance; and 0.07 < f 1 / f 11 < 0.35, where f1 represents a focal length of the first lens unit, and f11 represents a focal length of the first sub-lens unit. the at least two lens units of the magnification-varying lens unit include, in order from the object side, a second lens unit having negative refractive power which moves in an optical axis direction during varying magnification and a third lens unit which moves in the optical axis direction during varying magnification; the first lens unit is composed of, in order from the object side, a first sub-lens unit having positive refractive power, a second sub-lens unit having negative refractive power, and a third sub-lens unit having positive refractive power; the second sub-lens unit is driven to the object side so as to perform focus adjustment to an object at a short distance; and 0.07 < f 1 / f 11 < 0.35, where f1 represents a focal length of the first lens unit, and f11 represents a focal length of the first sub-lens unit.