PROBLEM TO BE SOLVED: To ensure watering in the vicinity of an irrigation tube in an irrigation region, to have high uniformity of water amount, to maintain the uniformity against a change in water pressure of supplied water, and to have uniform irrigation in the longitudinal direction. An irrigation tube is provided. SOLUTION: An irrigation tube made of a thermoplastic resin composition, which is flat when water is not passed and has a rounded shape when water is passed inside, and is predetermined on only one side thereof in a large number of longitudinal directions. Each small hole in the X-axis direction has small holes formed by an array pattern of repeating lengths, and the direction perpendicular to the center line that divides one side of the irrigation tube into two along the longitudinal direction is the X-axis. When the position of the hole is expressed as 0% at the end and 100% at the center with respect to the length from the center of the X-axis to the end of the one side, the small hole in the arrangement pattern is at the position of 95 to 99%. There are 16 to 70% of the pores in the total number of pores, and 15 to 30% of the pores in the arrangement pattern at 60 to 75% of the total number of pores. [Selection diagram] None【課題】灌水領域における灌水チューブ近傍の散水を確保しつつ、水量の均一性が高く、供給する水の水圧の変化に対してその均一性を保持し、且つ、長手方向に均一灌水性を有する灌水チューブを提供する。【解決手段】非通水時には扁平であり、内部に通水されると丸みを帯びる形状となる、熱可塑性樹脂組成物からなる灌水チューブであって、その片面にのみ多数の長手方向に所定の長さの繰り返しの配列パターンで形成された小孔を有し、前記灌水チューブの片面を長手方向に沿って２分する中心線に対して垂直な方向をＸ軸とし、Ｘ軸方向における各小孔の位置を、Ｘ軸の中心から前記片面の端部までの長さについて、端部を０％、中心部を１００％として表すとき、９５～９９％の位置に前記配列パターン中の小孔の総数に対して１６～７０％の小孔が存在し、且つ、６０～７５％の位置に前記配列パターン中の小孔の総数に対して１５～３０％の小孔が存在する。【選択図】なし
