N- and W-sector magnets of RIKEN Separated Sector Cyclotron have been completed and mechanical deformation has been measured in full load operation. Measured maximum reduction of pole gap distance (80 mm) was 0. 225 mm (B equals 15. 7 kG). Downward displacement of lower pole face was 0. 19 mm (B equals 16. 2 kG) in the top region. Main Coil deformation was also measured and an effect of thermal expansion was observed. The values were reasonable in comparison with FEM analysis results.