A probe array includes a probe-carrying substrate and a base member. The probe-carrying substrate has first and second principal surfaces extending parallel to each other, and a plurality of probe carriers carrying probe molecules. The base member has a reference surface extending parallel to a fluorescence-receiving surface, and a seating surface supporting the probe-carrying substrate and extending in a direction other than a direction parallel to the reference surface. The probe carriers each have a plurality of surfaces forming different angles with respect to the fluorescence-receiving surface, the plurality of surfaces including a bottom surface and uprising surfaces extending from the bottom surface. Accordingly, the plurality of surfaces have different sensitivities, realizing a wide dynamic range.