The present paper reports more extensive and precise experimental results about the isotope shifts of Sm I in the 635 nm - 690 nm range by Doppler-free saturation absorption spectroscopy using a single-mode diode laser with a small linewidth. We measured newly the isotope shifts and hyperfine structures of 20 linewidth. We measured newly the isotope shifts and hyperfine structures of 20 transition lines, which are mostly originating from the (4f~66s~2)~7F_J to (4f~66s6p) ~9D_o ~9F_o and ~7G_o levels, with a resolution better than 8 MHz. The measured isotope shfits were resolved into mass shifts and field shifts by King plot analysis. Finally, we could obtain the changes in mean-square nuclear charge radii from field shifts, and they were compared with the previous results.
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