Problem to be solved: to provide a Fourier transform infrared spectrophotometer (FTIR) capable of easily replacing the drying agent and suppressing the running cost for dehumidification.Solution: ftir1 is provided with an interferometer having an optical element (beam splitter 103) having a sharpness, a closed chamber 10 containing an interferometer and having an opening 11, and a desiccant unit 40.The desiccant unit 40 has a lid portion 41 capable of sealing the opening 11 and a case portion 42 which is detachably mounted on the cover portion 41 and accommodates the drying agent 92, which can be inserted into the closed chamber 10 from the opening 11.According to the ftir1, the user can easily replace the desiccant 92 without putting it into the closed chamber 10, and use the commercially available desiccant 92 and repeatedly use the lid 41 Running costs for dehumidification can be suppressed.Diagram
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