PROBLEM TO BE SOLVED: To provide an ejector capable of flexibly responding to various usage environments and having improved usability. SOLUTION: The ejector main body A is provided, and the ejector main body A is provided with a nozzle N inside, and a driving water inflow portion A1 into which the driving water w1 flows in, and a suction water w2 inside as the driving water w1 flows in. It has an inflowing suction water inflow part A2, a mixing part A3 in which the driving water w1 and the suction water w2 are mixed inside, and a drainage part A4 for discharging the driving water w1 and the suction water w2 to the outside. The water inflow portion A1 and the drainage portion A4 include hose attachment portions A1a and A4a to which a flexible hose H can be attached and detached at their ends. [Selection diagram] Fig. 1
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