A wire protection pipe through which a wire is to be passed and that is configured to be attached to a vehicle body, the wire protection pipe including: an underfloor configured to be arranged under a floor of the vehicle body; and a flat portion that is provided in the underfloor, the flat portion having a flat shape in a cross section that intersects an axial direction, as a result of a recess being provided on an upper side or a lower side in a state of the under floor being attached to the vehicle body.