PROBLEM TO BE SOLVED: To provide a microneedle of which the tip surely penetrates the epidermis and reaches the dermis when the skin is pierced, and which is capable of supplying chemicals or the like to the dermis or a deeper region and leaving the chemicals or the like in the dermis or the deeper region.SOLUTION: A microneedle (10, 110) comprises a conical or pyramid-shaped tip part (2, 102) of which the tip is sharpened, and a base (1) in a conical trapezoid or pyramid trapezoid shape. A step part (S1, S2) is formed in a boundary between an end of the tip part (2, 102) closer to the base and an end of the base (1) closer to the tip part.SELECTED DRAWING: Figure 1COPYRIGHT: (C)2018,JPO&INPIT【課題】 皮膚に穿刺した際に先端が確実に表皮を貫通して真皮に到達し、真皮或いはそれよりも深い領域に薬品等を供給することが出来て、且つ、当該薬品等を真皮或いはそれよりも深い領域に残存させることが出来るマイクロニードルの提供。 【解決手段】 本発明のマイクロニードル(10、110)は、先端が鋭利な円錐形或いは角錐形の先端部(2、102)と円錐台形或いは角錐台形の基台(1)を有し、先端部(2、102)の基台側端部と基台(1)の先端部側端部の境界に段部(S1、S2)が形成されている。【選択図】図1
