CUSTOMIZED COSMETIC KIT

A cosmetic kit provides cosmetics which are customized (personalized) for each user and a cosmetic provision device which uses the kit to supply customized cosmetics. The cosmetic kit includes a plurality of cosmetic bases, and is used for customized cosmetics which are prepared by mixing the plurality of cosmetic bases in accordance with recipe information determined on the basis of user unique information. The cosmetic kit provides that when a container containing at least two cosmetic bases selected from the plurality of cosmetic bases is rotated at a prescribed speed, and a near-infrared measurement of the bases in the container is performed at prescribed time intervals, the time (T) required to obtain an nth measurement, in which the rate of change between the absorbance in the nth measurement and the absorbance in the previous ((n−1)th) measurement is 100%±5%, and the rate of change with respect to the absorbance in the following ((n+1)th) measurement is 100%±5%, is not more than 35 minutes.