PROBLEM TO BE SOLVED: To easily clean a fluid passage and check the state of the fluid passage.SOLUTION: A heat exchanger (1) performs heat exchange between a heat exchange object liquid (110) and a fluid for heat exchange (120). The heat exchanger (1) includes a passage formation part having a substantially funnel conical part shape. The passage formation part (11) includes a first passage that is formed into a substantially spiral shape on an inner peripheral surface of the passage formation part (11) and serves as a passage of the heat exchange object liquid (110). The first passage is a groove shaped passage where a vertical upper portion is open.COPYRIGHT: (C)2015,JPO&INPIT【課題】流体流路の洗浄および流体流路の状態確認を容易に行う。【解決手段】被熱交換液体(110)と熱交換用流体(120)との間で熱交換を行う熱交換器(1)であって、略漏斗の円錐部分の形状の流路形成部(11)を備え、流路形成部(11)は、流路形成部(11)の内周面上に略螺旋状に形成された、被熱交換液体(110)の流路である第1流路を有し、第1流路は、鉛直上方部分が解放されている溝状の流路である。【選択図】図6
