A connecting device includes a cylindrical body (11) to both ends of which are connected an endoscope and a television camera and from which a light guide provided with an eyepiece section (28) at its one end for connecting a steal camera is extended. In the cylindrical body (11) is provided a support in which first and second prisms (21), (22) having different light splitting ratios are movably provided to selectively face the other end of the light guide (25).
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