<；P>；PROBLEM TO BE SOLVED: To provide a medicine delivery device improving the efficiency in supplying medical agent to a living body. <；P>；SOLUTION: This medicine delivery device is so formed that the thickness of a wall face of a liquid medicine layer nearest from a second micro-needlelike structure side is smaller than the height of the second needlelike structure, when it is pushed, mechanical stress is concentrated in the distal end of the second needlelike structure so that, even if pushing strength is low, the second micro-needlelike structure punctures the wall face of the liquid medicine layer to efficiently release the medicine retained in a medicine retention section. <；P>；COPYRIGHT: (C)2008,JPO&INPIT
