[Problem] To provide: a steelmaking slag-coated seed which can be provided with a steelmaking slag coating layer of a uniform and sufficient amount, and which requires less labor by an operator and for which low cost production is possible and a production method therefor. [Solution] A steelmaking slag-coated seed has a seed such as rice, and a steelmaking slag layer formed on the outside of the seed. The steelmaking slag layer is a coating layer comprising a steelmaking slag powder formed by pulverizing steelmaking slag. The steelmaking slag contains a calcium content of at least a prescribed amount with respect to all components of the steelmaking slag.
