An injection needle connected to a syringe includes a tip and a tail, the tail is connected to an injection hole of the syringe, wherein a plurality of colored blocks are disposed on a surface of the injection needle from 1mm near the tip toward the tail. The injection needle of the utility model may help operators to determine the depth of the injection needle inserted into skin or affected regions.一種注射針,連接於針筒,注射針包括針頭以及尾端,尾端連接針筒的注液口,其中注射針的表面上、且在針頭朝向尾端後1mm位置開始,具有多個不連續、且間隔距離相同的標色區塊。本創作的注射針在使用時可幫助操作者判斷注射針插入皮膚或是患部的深度。10‧‧‧注射針12‧‧‧針頭14‧‧‧尾端16‧‧‧表面18a‧‧‧紅色標色區塊18b‧‧‧橙色標色區塊18c‧‧‧黃色標色區塊18d‧‧‧綠色標色區塊18e‧‧‧藍色標色區塊18f‧‧‧靛色標色區塊18g‧‧‧紫色標色區塊18h‧‧‧黑色標色區塊20‧‧‧針筒22‧‧‧注液口
