PROBLEM TO BE SOLVED: To manufacture a balloon having uniform film thickness distribution.SOLUTION: A manufacturing device 5 of a parison for manufacturing a balloon used for a balloon catheter, which has extension parts at both ends of the straight cylindrical part, includes: a pair of fixing mechanisms 50 and 50 for releasably fixing both ends of a tube 1 for a straight tubular parison respectively; heating molds 51 and 51 for heating part of one end side and part of the other end side of the tube 1 for the parison fixed to the fixing mechanisms 50 and 50; extension mechanisms 53 and 53 for extending the tube 1 for the parison by energizing one of the pair of fixing mechanisms 50 and 50 with respect to the other so as to separate them; and tension detection means 54 and 54 for detecting tension generated in the tube 1 for the parison when the extension mechanisms 53 and 53 are actuated.SELECTED DRAWING: Figure 6A【課題】均一な膜厚分布を有するバルーンを製造すること。【解決手段】バルーンカテーテルに用いられるバルーンを製造するための、直胴部の両端に延伸部を有するパリソンの製造装置5である。直管状のパリソン用チューブ1の両端をそれぞれ解除可能に固定する一対の固定機構50,50と、固定機構50,50に固定されたパリソン用チューブ1の一端側の一部および他端側の一部を非接触で加熱する加熱金型51,51と、一対の固定機構50,50の一方を他方に対して離間するように付勢して、パリソン用チューブ1を延伸させる延伸機構53,53と、延伸機構53,53を作動させた際に、パリソン用チューブ1に生じている張力を検出する張力検出手段54,54と、を有する。【選択図】図6A