A kit is constituted by: a stratum corneum collecting device formed by a rod shaped portion having a grip portion to be gripped by a user at one end, a columnar portion which is continuous with the other end of the rod shaped portion, and an adhesive layer formed on a circumferential surface of the columnar portion; and a solvent container, a solvent container, which is a bottomed cylindrical container having an opening in an upper portion thereof, containing a solvent for extracting a component from stratum corneum collected by the adhesive layer, the solvent container receiving the columnar portion of the stratum corneum device through the opening so as to enable the adhesive layer to be immersed in the solvent. A lid and a solvent outlet, which is opened to take the solvent out from the interior of the solvent container, are provided.
