To raise working efficiency, such as wire changing work by enabling a desired coated optical fiber in which work, such as wire changing work is required to be found out more easily as compared with the conventional coated optical fiber tray in which a plurality of coated optical fibers are housed collectively in one extra length housing area.

This coated optical fiber tray is configured so that only the extra lengths of trays F1 to F5 each of which is a tray for one line of a coated optical fiber are housed in respective extra length housing areas 7s, 7t.