PROBLEM TO BE SOLVED: To provide a liquid storage part which is easily collapsed by a user and allows the user to easily feels that the container has been fully collapsed, and also to provide a PCA (Patient Controlled Analgesia) boost pump.SOLUTION: The liquid storage part 10 is used for the PCA boost pump 100 and stores a liquid and discharge the liquid by being pushed and collapsed. The liquid storage part 10 is formed in a nearly cylindrical shape where an opening is formed at one end and the other end is closed. On the outer peripheral surface of the cylindrical shape, at least two chevron parts 10a, 10b projecting over a whole circumference with the axial line c of the cylindrical shape as a center and a valley part 10c formed between the chevron parts 10a, 10b are formed along the axial line c. The valley part 10c is more hardly collapsed in the extending direction of the axial line c compared with the chevron parts 10a, 10b.COPYRIGHT: (C)2013,JPO&INPIT【課題】 本発明は、使用者が容器を潰し易く、かつ、容器を潰し切った感覚を得易い貯液部、及びPCAブーストポンプを提供することを目的とする。【解決手段】液体を貯留し、押し潰されることにより前記液体を吐出させる、PCAブーストポンプ100に用いるための貯液部10において、一端に開口が形成されているとともに他端が閉じられた略円筒形状に形成され、前記円筒形状の外周面は、前記円筒形状の軸線cを中心に全周にわたって突出する少なくとも2つの山部10a,10bと、前記山部10a,10bどうしの間に形成された谷部10cとが前記軸線cに沿って形成され、前記谷部10cは、前記山部10a,10bよりも前記軸線cの延びる方向に潰れ難く形成した。【選択図】 図6
