The interferometer of IRAffinity-1S is continuously optimized by a dynamic alignment mechanism, and a built-in Automatic Dehumidifier helps ensure ease of maintenance. The IRAffinity-1S offers the high SN ratio (30,000:1, 1-minute accumulation, neighborhood of 2,100 cm^-1, peak-to-peak), a maximum resolution of 0.5 cm^-1, and compact dimensions. Furthermore, the high-performance LabSolutions IR software, which emphasizes operability, and analysis support programs (Contaminant analysis program and Pharma Report program) make it easier to perform data processing and analysis.