There are provided a three-way direction cock unit, check valve and fluid delivery device which are easily miniaturized with high qualified rate at low cost, comprising: a first casing having a valve seat which has an aperture a second casing inserted into said first casing and a valve body gripped between said valve seat and an opening edge of said second casing.本發明係提供一種易於小型化、成品合格率高且製造成本低廉之三向活栓單元,逆止閥以及流動性物質輸送裝置。本發明係與三向活栓單元相關之逆止閥,具備:第一外殼,具有設置開口之閥座;第二外殼,其插入至該第一外殼內;閥體,其被該第一外殼之閥座與該第二外殼之開口端部所夾持。閥體於與第一外殼之閥座上所設置之開口之外周緣部相比偏向外側且與第二外殼之內周緣部相比偏向內側處,設置有略U字狀裂口。而且,裂口內側部分用作為開閉閥,且於裂口外側部分上第一外殼之閥座與第二外殼之開口端部之間密閉為液密狀態。1A...三向活栓單元2A...袋體3...輸送用導管4...分支流路5A...第一閥部6A...第二閥部7A...注射器8...第一流路9...第二流路10...第三流路54...圓筒部55...柱塞部59...第一凸緣部60...第二凸緣部63...環形部件100A...流動性物質輸送裝置
