PROBLEM TO BE SOLVED: To provide a liquid circuit whose shape is hardly collapsed when the whole circuit is gathered together so as to be folded and which can inhibit a failure from being generated by a kink or the like caused by flexure of a tube.SOLUTION: A liquid circuit 1 comprises: a liquid channel 3 which has a flexible tube 2 and is capable of being folded at the tube 2 a heating panel 5, pump tube holder 6, and measure chamber panel 8 which divide the liquid channel 3 into a plurality of channel parts 4A, 4B and 4C and keep them in formed shapes, correspond to the channel parts 4A, 4B and 4C respectively, and overlap with each other when the liquid channel 3 is folded and positioning parts 9A and 9B for fixing relative positions of the overlapped heating panel 5, pump tube holder 6, and measure chamber panel 8.COPYRIGHT: (C)2015,JPO&INPIT【課題】全体を折り畳むように纏めた際に形状が崩れ難く、更に、チューブの曲げに起因したキンク等により不具合が生じることを抑制できる液体回路を提供する。【解決手段】可撓性を有するチューブ2を有し、チューブ2で折り畳み可能な液体流路3と、液体流路3を複数の流路部4A,4B,4Cに分けて定形状にて保持すると共に、前記各流路部4A,4B,4Cに対応し、且つ、液体流路3を折り畳んだ際に互いに重なり合う加温パネル5、ポンプチューブホルダー6、及び計量チャンバパネル8と、重なり合った加温パネル5、ポンプチューブホルダー6、及び計量チャンバパネル8同士の相対位置を固定する位置決め部9A,9Bと、を備える液体回路1である。【選択図】図3