PROBLEM TO BE SOLVED: To provide plant seed with high safety to humans/livestock and good environmental protection, capable of controlling or reducing rat injury, and also good in germination. SOLUTION: The plant seed to be sown, capable of controlling rat injury and good in germination, is such that its surface is coated with a coating agent containing a substance that repels rat's eating action and improves its germination rate, wherein the substance is preferably capsaicins of the general formula(I)( wherein, R is a 7-12C alkyl or alkenyl ). COPYRIGHT: (C)2008,JPO&INPIT