A powder compaction mold comprising a die and upper and lower punches (3, 4) configured to fit into the die, the powder compaction mold being configured to compress a powder between the upper and lower punches to manufacture a powder compact, wherein, of the members forming the powder compaction mold, at least one of two members in sliding contact with each other has therein a vent passage through which gas is vented from a filling space for the powder surrounded by the die and the lower punch to an outside of the powder compaction mold, and wherein the vent passage has a gas intake port that is open to a clearance section formed between the two members and connecting to the filling space, characterized in that the lower punch comprises a plurality of punch segments (4A, 4B, 4C) formed as hollow members, the plurality of punch segments comprising a first punch segment, a second punch segment and a third punch segment, wherein the vent passage is formed in at least one of the punch segments, wherein the powder compaction mold further comprising a core rod extending through the center of the lower punch, wherein the plurality of punch segments (4A, 4B, 4C) are arranged coaxially with the core rod, wherein the powder compaction mold has clearance sections formed between the inner peripheral surface of the die and the outer peripheral surface of the first punch segment, between the inner peripheral surface of the first punch segment and the outer peripheral surface of the second punch segment, between the inner peripheral surface of the second punch segment and the outer peripheral surface of the third punch segment, and between the inner peripheral surface of the third punch segment and the outer peripheral surface of the core rod, wherein the vent passage is formed in the first punch segment, which is the radially outermost segment of the lower punch, and the vent passage includes an axial passage, a radial passage extending toward the inner peripheral surface of the die, and a radial passage extending toward the outer peripheral surface of the second punch segment. wherein, of the members forming the powder compaction mold, at least one of two members in sliding contact with each other has therein a vent passage through which gas is vented from a filling space for the powder surrounded by the die and the lower punch to an outside of the powder compaction mold, and wherein the vent passage has a gas intake port that is open to a clearance section formed between the two members and connecting to the filling space, characterized in that the lower punch comprises a plurality of punch segments (4A, 4B, 4C) formed as hollow members, the plurality of punch segments comprising a first punch segment, a second punch segment and a third punch segment, wherein the vent passage is formed in at least one of the punch segments, wherein the powder compaction mold further comprising a core rod extending through the center of the lower punch, wherein the plurality of punch segments (4A, 4B, 4C) are arranged coaxially with the core rod, wherein the powder compaction mold has clearance sections formed between the inner peripheral surface of the die and the outer peripheral surface of the first punch segment, between the inner peripheral surface of the first punch segment and the outer peripheral surface of the second punch segment, between the inner peripheral surface of the second punch segment and the outer peripheral surface of the third punch segment, and between the inner peripheral surface of the third punch segment and the outer peripheral surface of the core rod, wherein the vent passage is formed in the first punch segment, which is the radially outermost segment of the lower punch, and the vent passage includes an axial passage, a radial passage extending toward the inner peripheral surface of the die, and a radial passage extending toward the outer peripheral surface of the second punch segment.