PROBLEM TO BE SOLVED: To provide a kit or device for detecting psychological stress, and a method of detecting the same.SOLUTION: A kit or device for detecting psychological stress includes a nucleic acid that can specifically bind to miRNA in a sample of a subject. A method of detecting psychological stress includes measuring the expression level of the miRNA in vitro.SELECTED DRAWING: Figure 2COPYRIGHT: (C)2018,JPO&INPIT【課題】心理的ストレスを検出するキット又はデバイス、並びに、検出方法を提供する。【解決手段】被験体の検体中のmiRNAと特異的に結合可能な核酸を含む、心理的ストレス検出用キット又はデバイス、並びに、該miRNAの発現量をin vitroで測定することを含む心理的ストレスを検出するための方法。【選択図】図2