A microscope tube lens that forms an enlarged image of an object by being combined with an infinity-corrected objective, the tube lens comprising in an order from an object side: a first lens group that has positive power and that includes a cemented lens a second lens group that has negative power and a third lens group that has positive power, wherein a following condition expression is satisfied, where NA is a numerical aperture on an image side of the tube lens, FN is a field number of the tube lens, and ϵ is an airy disk diameter with respect to d line (588 nm) of the tube lens: 0.04< NA and 1700≤ FN/ϵ.Ģ.
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