| 摘要 |
PROBLEM TO BE SOLVED: To provide a microneedle which stays at a stratum corneum in the context where a microneedle as a cosmetic is not allowed be implanted to a depth of skin by penetrating a stratum corneum under the regulation of the Pharmaceutical Affairs Law.SOLUTION: The microneedle can penetrate a surface of skin stratum corneum, but has resistance with respect to implantation to a depth. The microneedle has a structure having step difference such as an angle base type or slide type and only a sharp tip end is implanted, and a structure whose tip end is not sharp and from the tip end of which thickness gradually increases, such as a composite volcano type, preferably. |
