An objective of this invention is to provide an apparatus and a method for diagnosing skin state in a multifaceted and integrated manner.An skin diagnosing apparatus 1 according to an embodiment includes an optical unit 2 containing an optical system using OCT, an optical mechanism 4 for guiding light from the optical unit 2 to skin S and scanning the light, a load device 5 for applying a deformation energy to the skin S, a control arithmetic unit 6 controlling driving of the load device 5 and the optical mechanism 4 and processing optical interference signal outputted from the optical unit 2 according to the driving thereof, thereby calculating a tomographic distribution of a predetermined state value with respect to the skin S and calculating an evaluation value of the skin S based on the tomographic distribution, and a display device 74 displaying the evaluation value of the skin S. The control arithmetic unit 6 respectively calculates the mechanical characteristics and the blood flow state of the skin S as the above-described state value, and calculates the evaluation value by associating the mechanical characteristics and the blood flow state with the tomographic position of the skin S.本發明係提供多方面且統合性地對皮膚狀態進行診斷之用的裝置及方法。本發明一態樣的皮膚診斷裝置1係具備：光學單元2，係含有使用OCT的光學系統；光學機構4，係用以將來自光學單元2的光導向皮膚S並令該光進行掃描；負荷裝置5，係用以對皮膚S賦予變形能量；控制演算部6，係控制負荷裝置5及光學機構4的驅動，相應於該些驅動而處理從光學單元2輸出的光干涉信號，藉此針對皮膚S演算預設的狀態值的斷層分布，根據該斷層分布演算皮膚S的評估值；及顯示裝置74，係顯示皮膚S的評估值。控制演算部6係分別演算皮膚S的力學特性及血流狀態作為前述狀態值，藉由使該力學特性與血流狀態關聯對應至皮膚S的斷層位置而演算評估值。
