An objective includes: a first lens group that includes a meniscus lens component that is the closest to an image among lens components of the first lens group, the meniscus lens component having a convex surface facing an object; and a second lens group that is closer to the image than the first lens group is, and the objective satisfies the following conditional expressions: 0≤|Δz1|/DOFe≤1.5  (1) 0≤|Δz2|/DOFe≤2  (2) where Δz1 indicates a difference between a h-line minimization position and an e-line minimization position; Δz2, a difference between a position on then optical axis at which an RMS wavefront aberration in light having a wavelength of 800 nm is minimized and the e-line minimization position; DOFe, a depth of focus for the e line.