To provide a penetration sleeve capable of being efficiently and easily constructed with good appearance in a secured state of insertion cross-sectional area of a long body, even when both openings of a through hole formed in a segment are formed in a displaced state to avoid an obstacle in the segment.

This penetration sleeve S for inserting the long body mounted in the through hole 1 formed in the segment W includes a plurality of sleeves S1 and S2 which can be bendably connected to each other.