A measuring device that can obtain a stable measurement result is realized. The measuring device includes a measuring portion (14) that is arranged in one of a placing portion (12) where a fingertip portion (A) is placed, and an interposing portion (11) facing the placing portion (12), and interposing, together with the placing portion, the fingertip portion (A), emits excitation light and receives fluorescence, and a fixing force supply portion (13) that supplies, to the fingertip portion (A) through the interposing portion (11), force which is capable of fixing a relative positional relationship between the fingertip portion (A) and the measuring portion (14).
