PROBLEM TO BE SOLVED: To provide a structure of a syringe which is convenient for injecting a drug. SOLUTION: This is a structure of a syringe mainly composed of one cylinder part, and one lower positioning table 11 is provided at the bottom of the cylinder part, and one upper positioning table 12 is provided at the top of the cylinder part. .. One compression unit 14 is provided above the upper localization table, and one press unit 15 is provided above the compression unit. One needle tube 16 is fixed to the upper positioning table and is located inside the compression section, and the needle tip 160 of the needle tube is located below the puncture surface 150 of the press section. One upper convex edge 111 and one lower convex edge 112 are provided on the inner wall surface of the lower localization table, and one upper ring tank 125 and one lower ring tank 126 are provided on the outer wall surface of the upper localization table. A plurality of expansion/contraction orientation rings 13 are provided between the upper orientation base and the lower orientation base so as to be in contact with each other. A localization protrusion 130 and a localization groove 131 to be fitted are provided. [Selection diagram] Figure 2【課題】薬剤を注射するのに便利な注射器の構造を提供する。【解決手段】主に一つのシリンダー部１０で構成する注射器の構造であって、該シリンダー部の底部に一つの下定位台１１を設け、該シリンダー部の頂部に一つの上定位台１２を設ける。該上定位台の上方に一つの圧縮部１４を設け、該圧縮部の上方に一つのプレス部１５を設ける。一つの針管１６は該上定位台に固設し、且つ該圧縮部内に位置し、該針管の針先１６０は該プレス部の穿刺面１５０の下方に位置する。該下定位台の内壁面に一つの上凸縁１１１及び一つの下凸縁１１２を設け、該上定位台の外壁面に一つの上リング槽１２５及び一つの下リング槽１２６を設ける。該上定位台と該下定位台の間に、相互に套接する複数個の伸縮定位リング１３を設け、該伸縮定位リングは該シリンダー部の外部を覆設し、該伸縮定位リングに、相互に嵌設する定位突起部１３０と定位溝１３１を設ける。【選択図】図２
