An electric wire bundler is disclosed in which an anchor is provided on a bottom of an electric wire rest, and a boss is provided on a top of the rest so that an end face of the boss is located at a distance from an axis of the anchor. A flexible band extends from the boss and has a plurality of engaging portions at intervals in the longitudinal direction of the band. The boss has an insertion hole, into which the band is inserted from the end face. The boss is provided with an engaging means, which is engaged with one of the engaging portions of the band inserted into the hole.