The present invention relates to an analyzing device provided with: a light-measuring mechanism (6) that includes a light-emitting unit for emitting light onto a test tool (7) to analyze a sample and a light-receiving unit for receiving reflection light from the test tool (7); and a detecting mechanism (4) for detecting whether or not the test tool exists in a target area, the mechanism including a light-emitting unit for emitting light onto the test tool (7) and a light-receiving unit for receiving reflection light from the test tool (7). In the light-measuring mechanism (6), the light-emitting unit and light-receiving unit are disposed such that the light emission axis of the light-emitting unit and the light reception axis of the light-receiving unit are parallel or substantially parallel to each other. The detecting mechanism (4) is arranged such that the one or more light-receiving units selectively receive regularly-reflected light from the test tool (7) among the light emitted from the light-emitting unit.