WATER SAMPLER

PROBLEM TO BE SOLVED: To provide a water sampler capable of easily collecting sample water and preventing contamination of the sample water.SOLUTION: The water sampler 1 includes a sample water container 2; two water tubes 3 and 4 inserted into the sample water container 2; water sealing parts 5, 5 disposed at an end of each of the water tubes 3 and 4. The sample water container 2 has a container 2a provided with an opening in an upper part and a lid 2b attached to the container 2a. The water tubes 3 and 4 penetrate this lid 2b. A lower end of the water tube 3 is located near a bottom surface of the container 2a. A lower end of the water tube 4 is located above inside the container 2a. The water sealing part 5 contains a lead-through different-diameter joint 6 which the water tube 3 or 4 penetrates; a large-diameter tube 7 attached to the lead-through different-diameter joint 6 at one end; and a different-diameter joint 8 to which the other end of the large-diameter tube 7 is attached. The sample water such as ultrapure water is collected by flowing into the container 2 from the water tube 3.