| 摘要 |
Especially when observing brain tissue, damage inflicted on the brain tissue is reduced, and light from the brain tissue is collected to the utmost extent. The invention provides an objective lens in which a tip transparent member that is made to contact an observation object is formed to gradually narrow towards an end face thereof, a diameter d of the end face being defined by the following expression, and a maximum diameter D being 3 mm or less: 0 mmN) where FOV is the observation field of view, WD is the working distance, NA is the numerical aperture, and N is the refractive index of the observation object.
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