This contact lens is provided with a concave inner surface that comes into contact with a subject's eye, and a convex outer surface, and is provided with an incidence-side light guiding window that is formed to be cut from the outer surface to the inner surface side, and guides light incident from a direction approximately orthogonal to a lens geometric center axis such that the light travels along the direction approximately orthogonal to the lens geometric center axis in the aqueous humor of the subject's eye wearing the contact lens. Consequently, provided is the contact lens that makes it possible to noninvasively analyze a substance contained in the aqueous humor of the subject's eye.
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