A seed coating agent containing iron particles and a binder, and used for coating the surface of seeds, wherein the mass ratio of iron particles having a particle diameter of 45µm or less is 35-85% exclusive, the mass ratio of iron particles having a particle diameter of 63µm or less is greater than 75%, and the average particle diameter of the binder is 1-150µm. Thus provided is a coating in which the loss of iron particles is low in both the seeding and the transportation stages.
