A first die (21D) is sequentially filled with a first-layer mixed powder (100F) that is a mixture of a basic metal powder having a small particle size and a low-melting-point lubricant powder, a second-layer mixed powder (100S) that is a mixture of the basic metal powder having a large particle size and the low-melting-point lubricant powder, and a third-layer mixed powder (100T) that is a mixture of the basic metal powder having a small particle size and the low-melting-point lubricant powder. A first pressure is applied to each mixed powder to form an intermediate green compact (110). The intermediate green compact (110) is heated, and placed in a second die (41D). A second pressure is applied to the intermediate green compact (110) to form a high-density three-layer green compact.
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