The research on the design of ergonomic work facilities in the sandal assembly process aims to determine the differences experienced by workers in standard time, workload, musculoskeletal complaints, work fatigue, productivity when before and after the design is done. In addition, an analysis of microclimate conditions is carried out so that it is known whether the work space in the sandal assembly process meets the standards. For the research method, using a quantitative method, namely an analysis method in the form of numbers. Data is obtained objectively and subjectively and then analyzed using MS.Excel. then a Paired Sample T test was performed to determine whether the difference results experienced a significant change. The results showed that there was a difference in the use of old and new work facilities. It is known that the new design has a positive impact on workers both in standard time, workload, musculoskeletal complaints, work fatigue, and productivity. However, in musculoskeletal complaints it is known that the changes experienced by workers are not significant. As well as on microclimate conditions it is known that temperature, wind speed, and light intensity in the workspace do not meet standards, and only room humidity meets standards. Keywords : Design, Ergonomics, Produktivity, Microclimate.