To solve the following problem; to provide an optical fiber for connection with a wavelength selective function requires a part having the wavelength selective function is to be interposed halfway in the optical fiber for connection.

A wavelength selective optical fiber is built in a minute hole of a capillary for the optical connector, and an optical fiber fixing tool located at one end of the capillary is comprised of a V-groove substrate formed with a V-groove for mounting the optical fiber for connection, a presser cover for pressing the optical fiber into the V-groove, and a clamp spring for generating stress in the direction of pressing the optical fiber into the V-groove by applying the stress to the V-groove substrate and the presser cover, and is further characterized in that the wavelength selective optical fiber is aligned with the optical fiber for connection. Thus, the above problem is solved.

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