PROBLEM TO BE SOLVED: To provide a gripping mechanism which has simple structure, can strongly grip a hollow resin tube while a hollow core material is not inserted into the resin tube, and enables the inside of the resin tube to be pressurized or depressurized.SOLUTION: A resin tube gripping device is provided that grips a resin tube 2 and is for use in stretch-blow molding. The resin tube gripping device is constituted in such a way that: a grip functional part 110 having a resin tube charging hole 113, an airtight functional part 111 having the charging hole 113, and a movable wall 130 are aligned in order from a side of gripping the resin tube 2 (distal end side) inside the gripping device； the grip functional part 110 is compressed and a diameter of the resin tube charging hole 113 of the grip functional part 110 is reduced by moving the movable wall 130 to the distal end side, consequently the resin tube 2 charged into the resin tube charging hole 113 can be gripped, wherein the movable wall 130 has a flow channel 140 for pressurization/depressurization, penetrating into the movable wall 130 and connected to the resin tube charging hole 113.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2020,JPO&INPIT【課題】中空の樹脂製チューブに中空芯材を挿入しない状態で、樹脂製チューブを強力に把持を行うと共に、樹脂製チューブ内を加圧または減圧することを可能にした簡素な構造を持つ把持機構を提供する。【解決手段】樹脂製チューブ２を把持し延伸ブロー成型するための樹脂製チューブ把持装置であって、把持装置の内部に、樹脂製チューブ２を把持する側（先端側）から順に、樹脂製チューブ投入穴１１３を有する把持機能部１１０と、樹脂製チューブ投入穴１１３を有する気密機能部１１１と、移動壁１３０が並んでおり、移動壁１３０を先端側に移動させることによって、把持機能部１１０が圧縮され、把持機能部１１０の樹脂製チューブ投入穴１１３の径が減少し、樹脂製チューブ投入穴１１３に投入された樹脂製チューブ２を把持することができ、移動壁１３０は、移動壁１３０を貫通し樹脂製チューブ投入穴１１３に繋がる加圧・減圧用流路１４０を有する。【選択図】図３
