A powder molding die apparatus for powder molding comprising: a die with a through-hole for forming a side of a compact, the through-hole being defined vertically through an upper surface of the die; a lower punch to be fitted into the through-hole from beneath; an upper punch to be fitted into the through-hole from above; and a lubricant applying means for applying a lubricant to the through-hole, said lubricant applying means allowing the lubricant to be applied to the through-hole prior to filling a Fe-based or Cu·based raw powder in the through-hole from above, with the lower punch being fitted therein, so that the upper punch is allowed to be fitted into the through-hole after filling the through-hole with the raw powder to form a compact, characterized in that the lubricant is either dispersion liquid or solution produced by dispersing or dissolving lubricant in water, and that the through-hole is surface-treated so as to have a surface treatment layer which has a hydrophilic property and is formed by any one of means selected from the group consisting of: coating of oxide, fluoride, nitride, chloride, sulfide, bromide, iodide, carbide or hydroxide; subjecting a coating of titania or zinc oxide to photocatalytic reaction by means of irradiation of light; creating of hydroxide by alkali or hydrothermal processing, or by sputterings with potassium ions or sodium ions; and making use of change in surface tension of solution through a formation of fine pores on a surface, so that an angle of contact of the surface treatment layer relative to the lubricant L is smaller than an angle of contact of the die itself relative to the lubricant. a die with a through-hole for forming a side of a compact, the through-hole being defined vertically through an upper surface of the die; a lower punch to be fitted into the through-hole from beneath; an upper punch to be fitted into the through-hole from above; and a lubricant applying means for applying a lubricant to the through-hole, said lubricant applying means allowing the lubricant to be applied to the through-hole prior to filling a Fe-based or Cu·based raw powder in the through-hole from above, with the lower punch being fitted therein, so that the upper punch is allowed to be fitted into the through-hole after filling the through-hole with the raw powder to form a compact, characterized in that the lubricant is either dispersion liquid or solution produced by dispersing or dissolving lubricant in water, and that the through-hole is surface-treated so as to have a surface treatment layer which has a hydrophilic property and is formed by any one of means selected from the group consisting of: coating of oxide, fluoride, nitride, chloride, sulfide, bromide, iodide, carbide or hydroxide; subjecting a coating of titania or zinc oxide to photocatalytic reaction by means of irradiation of light; creating of hydroxide by alkali or hydrothermal processing, or by sputterings with potassium ions or sodium ions; and making use of change in surface tension of solution through a formation of fine pores on a surface, so that an angle of contact of the surface treatment layer relative to the lubricant L is smaller than an angle of contact of the die itself relative to the lubricant. coating of oxide, fluoride, nitride, chloride, sulfide, bromide, iodide, carbide or hydroxide; subjecting a coating of titania or zinc oxide to photocatalytic reaction by means of irradiation of light; creating of hydroxide by alkali or hydrothermal processing, or by sputterings with potassium ions or sodium ions; and making use of change in surface tension of solution through a formation of fine pores on a surface, so that an angle of contact of the surface treatment layer relative to the lubricant L is smaller than an angle of contact of the die itself relative to the lubricant.