To provide an improved connecting part of an optical fiber route determination board.

An optical fiber route determination board 5 for determining the routes of a plurality of optical fiber cables has one optical conductor 10 or a plurality thereof arranged between a first lower laminate layer 50a and a first upper laminate layer 50b. The optical conductor 10 is connected to at least one optical fiber of a plurality of optical fiber cables 12, at least one of the lower and upper laminate layers 50a and 50b is mounted on at least one sheath 40 for enclosing at least one optical fiber, extending over a first length. The board 5 suitably has a second laminate layer positioned between the first upper or lower laminate layer and the optical conductor, and by using two laminate layers, each laminate layer can have a different characteristic. One layer can reduce the horizontal stress between a connecting element and an enclosed optical fiber, and the other layer can reduce the longitudinal stress.