To provide a holder for a plastic optical fiber capable of controlling a deterioration in quality and a change in characteristics of the plastic optical fiber in the case of laying a plurality of plastic optical fibers or in the case of laying the plastic optical fiber and other cables.

The holder 1 for the plastic optical fiber, which is used when the plastic optical fibers 2 are laid in an object to be laid is provided with a holder body 4 in which a plurality of guide grooves 3 holding the plastic optical fibers 2 are formed in parallel and a cover 7 covering the guide grooves 3.