The purpose of the present invention is to further reduce the size and weight of an applicator. An applicator (A1) is provided with a housing (10), a piston plate (20), a micro-needle array (30), a conical coil spring (40), and an unlocking member (50). The housing (10) has a cylindrical body section (12) for housing the piston plate (20) and the conical coil spring (40), and also has a lid section (14) for gripping the conical coil spring (40) between the lid section (14) and the piston plate (20). The body section (12) has inner walls (12b1-12b4) for engaging the piston plate (20) with the housing (10) through protrusions (20c1-20c4). The body section (12) has vertically extending grooves (G1-G4). The piston plate (20) is guided in the axial direction of the body section (12) by the grooves (G1-G4). When the piston plate (20) is unlocked by the unlocking member (50), the piston plate (20) is moved within the body section (12) along the grooves (G1-G4) by the pressing force of the conical coil spring (40) and reaches an acting position on a skin.本發明提供一種實現更進一步小型化及輕量化之微型針施作器。本發明的微型針施作器(A1)具備框體(10)、活塞板(20)、微針陣列(30)、圓錐螺旋彈簧(40)及解除構件(50)。框體(10)具有收容活塞板(20)及圓錐螺旋彈簧(40)之筒狀的主體部(12)、以及在與活塞板(20)之間夾持圓錐螺旋彈簧(40)之蓋部(14)。主體部(12)具有經由突起(20c1~20c4)將活塞板(20)卡止在框體(10)之內側內壁(12b1~12b4)。主體部(12)具有沿上下方向延伸之槽部(G1~G4)。活塞板(20)藉由槽部(G1~G4)而沿主體部(12)的軸方向被引導。若活塞板(20)的卡止狀態藉由解除構件(50)而被解除,則活塞板(20)藉由圓錐螺旋彈簧(40)的作用力而沿著槽部(G1~G4)在主體部(12)內移動並到達皮膚的作用位置。A1‧‧‧微型針施作器14c‧‧‧缺口部H‧‧‧貫穿孔14a‧‧‧頂板14‧‧‧蓋部10‧‧‧框體14b‧‧‧圓筒構件40‧‧‧圓錐螺旋彈簧20‧‧‧活塞板50‧‧‧解除構件50c‧‧‧連結部50a‧‧‧內側部20c1~20c4‧‧‧突起20b‧‧‧圓筒構件20a‧‧‧主體30‧‧‧微針陣列50d‧‧‧突出部50b‧‧‧外側部12e‧‧‧凸緣構件12g4‧‧‧連結壁12c4‧‧‧外側內壁12g8‧‧‧連結壁G4‧‧‧槽部12b1~12b4‧‧‧內側內壁12g1‧‧‧連結壁G1‧‧‧槽部12g5‧‧‧連結壁12c1‧‧‧外側內壁12‧‧‧主體部10‧‧‧框體12g2‧‧‧連結壁12g6‧‧‧連結壁12a‧‧‧外壁12c2、12c3‧‧‧外側內壁12f‧‧‧缺口部H‧‧‧貫穿孔
