In a pressure infiltrating apparatus 20 according to the invention, an upper end of an inlet side orifice 23 in the drawing is formed to take a tapered convex shape and a lower end of an insertion hole of an intermediate orifice 25 in the drawing is formed to take a concave shape having a diameter gradually increased corresponding to the convex shape of the inlet side orifice 23. Consequently, a space A between the inlet side orifice 23 and the intermediate orifice 25 is set to be small without damaging the fluidity of a molten metal 11 between the inlet side orifice 23 and the intermediate orifice 25 in a bath container 22.