A fiber arrangement member includes: a tubular housing that houses a plurality of optical fibers; and a plurality of guide portions extending from a first end in an axial direction of the housing toward side areas of the first end. The guide portions extend from the housing in different directions from each other crossing an axial line of the housing. The guide portions comprise guide grooves that house the optical fibers and communicate with an inner space of the housing. The grooves are open at sides of the grooves opposite to a second end in the axial direction of the housing on entire lengths in extending directions of the grooves. The grooves selectively house the optical fibers extended from the first end in the axial direction of the housing. The optical fibers housed in one of the grooves move into another of the grooves.