Provided are a sample container holding member, an optical measurement device, and a sample container arrangement method capable of reducing a possibility that a sample leaks and contaminates an integrator. A sample container holding member 80 is detachably attached to an integrator 20 via a fixing member 70, and a sample container 40 having a cell 41 containing a sample 1 and a cap 42 is disposed in the integrator 20. Hold in state. The sample container holding member 80 includes a columnar column 81 fixed to the fixing member 70, and a container attachment 82 provided at the tip of the column 81 and to which the sample container 40 is attached. The container mounting portion 82 includes a storage portion 88 that stores the cap 42, and a holding portion 89 that holds at least three points on the outer peripheral surface of the cell 41 and holds the sample container 40. [Selection] Figure 2
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