An object of the present invention is to provide a microneedle and a microneedle array which can carry a large amount of not only a drug but also a stabilizer and a thickener and have good puncture properties. The present invention comprises a tip portion, a columnar portion, and a pedestal portion, and (i) the tip apex angle (α) is in the range of 15-60 ?, and (ii) the tip diameter (D0) is in the range of 1-20 μm. (Iii) The area (A3) of the upper surface of the pedestal portion is larger than the area of the bottom surface (A2) of the pillar body, and (iv) satisfies the following formulas (1) and (2), and H / D4 ≧ 3 (1 ) (H is the total height, D4 is the diameter of the bottom of the pedestal) β ≧ 90−0.5α (2) (β is the angle formed between the side surface of the pillar and the top of the pedestal, and α is the apex angle of the tip (V) The solid composition containing the drug adheres to the side surface of the columnar body, and satisfies the following formula (5): 10? ≤? ≤60? (5) (where γ is the apex of the tip portion) And a tangent line connecting the surface of the solid composition fixed to the side surface of the columnar part (microneedle) for transdermally administering a drug.本発明の目的は、薬剤のみならず安定剤や増粘剤を大量に担持することができ、かつ穿刺性が良好なマイクロニードルおよびマイクロニードルアレイを提供することにある。本発明は、先端部、柱身部および台座部からなり、（ｉ）先端頂角（α）が１５～６０°の範囲にあり、（ｉｉ）先端直径（Ｄ０）が１～２０μｍの範囲にあり、（ｉｉｉ）台座部上面の面積（Ａ３）が柱身部底面（Ａ２）の面積よりも大きく、（ｉｖ）下記式（１）および（２）を満足し、Ｈ／Ｄ４≧３ （１）（Ｈは全体の高さ、Ｄ４は台座部底面の直径である）β≧９０－０．５α （２）（βは柱身部の側面と台座部上面のなす角度、αは先端頂角である）（ｖ）柱身部の側面に薬剤を含有する固体組成物が固着し、下記式（５）を満足する、１０°≦γ≦６０° （５）（γは、先端部の頂点と、柱身部の側面に固着した固体組成物の表面を結ぶ接線とのなす角度である）経皮的に薬剤を投与するためのマイクロニードルである。
