A packaging machine for a particle-like material including: an inert gas introduction pipe; an inert gas exhaust pipe; and, a temporary closing equipment which is configured to temporarily close an opening portion of an airtight container filled with a particle-like material, while keeping the opening portion airtight with respect to the inert gas introduction pipe and the inert gas exhaust pipe which are configured to be inserted through the opening portion into the airtight container, wherein in the airtight container filled up with the particle-like material, an inert gas introduction portion provided to the inert gas introduction pipe, and, an inert gas exhaust portion provided to the inert gas exhaust pipe, are kept buried in the particle-like material, and the inert gas introduction pipe and the inert gas exhaust pipe are arranged apart from each other in the airtight container, characterized in that (i) the inert gas introduction portion provided to the inert gas introduction pipe is configured by a plurality of through holes, the diameter of which becoming larger as becoming more distant from the opening portion of the airtight container when the inert gas introduction pipe is inside the airtight container; and, the inert gas exhaust portion provided to the inert gas exhaust pipe is configured by a plurality of through holes, the diameter of which becoming larger as becoming more distant from the opening portion of the airtight container when the inert gas exhaust pipe is inside the airtight container; or (ii) the inert gas introduction portion provided to the inert gas introduction pipe is configured by one or a plurality of slit potions, the width of which becoming larger as becoming more distant from the opening portion of the airtight container when the inert gas introduction pipe is inside the airtight container; and the inert gas exhaust portion provided to the inert gas exhaust pipe is configured by one or a plurality of slit portions, the width of which becoming larger as becoming more distant from the opening portion of the airtight container when the inert gas exhaust pipe is inside the airtight container. an inert gas introduction pipe; an inert gas exhaust pipe; and, a temporary closing equipment which is configured to temporarily close an opening portion of an airtight container filled with a particle-like material, while keeping the opening portion airtight with respect to the inert gas introduction pipe and the inert gas exhaust pipe which are configured to be inserted through the opening portion into the airtight container, wherein in the airtight container filled up with the particle-like material, an inert gas introduction portion provided to the inert gas introduction pipe, and, an inert gas exhaust portion provided to the inert gas exhaust pipe, are kept buried in the particle-like material, and the inert gas introduction pipe and the inert gas exhaust pipe are arranged apart from each other in the airtight container, characterized in that (i) the inert gas introduction portion provided to the inert gas introduction pipe is configured by a plurality of through holes, the diameter of which becoming larger as becoming more distant from the opening portion of the airtight container when the inert gas introduction pipe is inside the airtight container; and, the inert gas exhaust portion provided to the inert gas exhaust pipe is configured by a plurality of through holes, the diameter of which becoming larger as becoming more distant from the opening portion of the airtight container when the inert gas exhaust pipe is inside the airtight container; or (ii) the inert gas introduction portion provided to the inert gas introduction pipe is configured by one or a plurality of slit potions, the width of which becoming larger as becoming more distant from the opening portion of the airtight container when the inert gas introduction pipe is inside the airtight container; and the inert gas exhaust portion provided to the inert gas exhaust pipe is configured by one or a plurality of slit portions, the width of which becoming larger as becoming more distant from the opening portion of the airtight container when the inert gas exhaust pipe is inside the airtight container.