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When low-energy cosmic-ray protons (LECRp) collide with interstellar gas, they ionize neutral iron atoms and emit the neutral iron line (Fe I K$\\alpha$) at 6.40keV. We search for the iron K-shell line in seven SNRs from the Suzaku archive data of the Galactic plane in the $6^{\\circ} \\lesssim l \\lesssim 40^{\\circ}, |b| < 1^{\\circ}$ region. All these SNRs interact with molecular clouds. We discover Fe I K$\\alpha$ line emissions from five SNRs (W28, Kes 67, Kes 69, Kes 78, and W44). 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