A liquid immersion type lens system includes: an optical system main body
that has an optical surface at one end along an optical axis, the optical
surface contacting a first immersion liquid; a light transmitting member
that has two surfaces, one on each end along the optical axis, is
disposed opposing the optical surface of the optical system main body,
one of the two surfaces contacting the first immersion liquid, the other
of the two surfaces contacting a second immersion liquid; and a holding
member that detachably supports the light transmitting member so that the
one surface opposes the optical surface of the optical system main body.