A drilling device capable of forming a high-quality through-hole is provided. A perforating apparatus 100 for forming a through hole by inserting a perforating needle 115 into a non-woven fabric sheet NWF, a perforating roll 110 having a plurality of perforating needles provided on an outer peripheral surface 111, and adjacent to the perforating roll. And a cylindrical cover 130 for supporting the nonwoven fabric sheet at the same height as the outer peripheral surface of the perforating roll, and the perforating roll inserts a perforating needle into the nonwoven fabric sheet passing through the perforation processing position and conveys the nonwoven fabric sheet. By rotating at a peripheral speed, a part of the rotational position of the outer peripheral surface of the perforated roll constitutes a part of the conveyance path of the nonwoven fabric sheet, and the cylindrical cover is equivalent to the perforation processing position by the perforated roll. Supports the conveying path at a height. [Selection] Figure 4【課題】高品質な貫通孔を形成可能な穿孔装置を提供すること。【解決手段】不織布シートＮＷＦに穿孔針１１５を刺し込んで貫通孔を形成する穿孔装置１００であって、複数の穿孔針が外周面１１１に設けられている穿孔ロール１１０と、この穿孔ロールに隣接して不織布シートを該穿孔ロールの外周面と同等の高さに支持する円筒カバー１３０とを備えて、穿孔ロールは穿孔処理位置を経由する不織布シートに穿孔針を刺し込んで該不織布シートの搬送速度の周速度で回転することにより当該穿孔ロールの外周面の回転位置の一部が当該不織布シートの搬送経路の一部を構成し、円筒カバーは不織布シートを穿孔ロールによる穿孔処理位置と同等の高さの搬送経路に支持する。【選択図】図４
