To provide a technique for easily orienting a discharge hole of a needle in an injection needle formation body.SOLUTION: An injection needle formation body attached to a tip of a syringe body comprises: one or more hollow needles comprising a direction vertical to a longitudinal direction on a discharge hole on a tip, comprising a direction vertical to a longitudinal direction on an outer peripheral shape of a cross section, and directions of the discharge hole and outer peripheral shape are regulated to a prescribed relative relationship； and a formation body main body comprising a columnar shape having an inner space, having a front end covered with a contact surface with a hole, having a rear end with an opening to which the syringe body is attached, in the formation body main body, a needle attachment hole for penetrating the hollow needle is provided from the contact surface with a hole to the inner space, an inner peripheral shape of the needle attachment hole is oriented corresponding to the outer peripheral shape of the hollow needle, the needle attachment hole is oriented to a prescribed direction in view from the contact surface with a hole.SELECTED DRAWING: Figure 1【課題】注射針形成体における針の吐出口を容易に方向付ける技術を提供する。【解決手段】注射器本体の先端部に装着される注射針形成体は、先端の吐出口に長手方向に垂直な方向があり、断面の外周形状にも長手方向に垂直な方向があり、前記吐出口の方向と前記外周形状の方向が所定の相対関係に規定された１本以上の中空針と、内部空間を有する円柱形状を有し、前方端が有孔当接面で覆われ、後方端に前記注射器本体を取り付ける開口があり、前記有孔当接面から前記内部空間まで前記中空針を貫通させる針取付孔が配設され、前記針取付孔の内周形状には前記中空針の外周形状に対応して方向があり、前記針取付孔は前記有孔当接面側から見て所定の方向に方向付けされている形成体本体と、を有している。【選択図】図１
