PROBLEM TO BE SOLVED: To provide a method for producing a microneedle with the number of needles of 100 or more.SOLUTION: The present invention provides a method for injection molding a microneedle with the number of needles of 100 or more. The method performs a heat cycle in which: while the inside of the cavity of a die is degassed and depressurized from outside, the inside of the cavity is increased in its temperature so that it falls within a range of 100°C or more and 140°C or less a mold resin is injected into the cavity to mold a microneedle and thereafter, the internal temperature of the cavity is decreased to room temperature.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】針本数が100本以上のマイクロニードルの製造方法を提供する。【解決手段】針本数が100本以上のマイクロニードルの射出成形方法であって、金型のキャビティ内部を外部から脱気減圧しながら、キャビティ内部を100℃以上140℃以下の範囲になるまで昇温させ、キャビティ内部へ成形樹脂を射出してマイクロニードルを成形した後、キャビティ内部を室温まで低下させるヒートサイクル行う。【選択図】図1
