To provide a rice seed coating agent that enables multi-layer ageing and can be manufactured at low cost because heat generation due to oxidation reaction is prevented in comparison with a conventional iron powder-based coating agent.SOLUTION: A rice seed coating agent is provided with iron powder where a white pig iron metallographic structure is formed in a portion or all, in which an amount of metal iron is not less than 80.5% of the whole. The iron powder can be obtained by performing magnetic force sorting, crushing and screen sizing. The powder having the white pig iron metallographic structure has a slow reaction velocity of oxidation reaction, and therefore the heat generation is also slow. Accordingly, extinction of rice seeds is prevented, and it is superior as the rice seed coating agent.SELECTED DRAWING: Figure 1
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