In a sample-analyzing system including an analyzer (10) for analyzing a sample, an auto-sampler (20) for sequentially introducing a plurality of samples into the analyzer (10), and a controller (40) for controlling operations of the analyzer (10) and the auto-sampler (20), the auto-sampler (20) is provided with a sample rack holder (24) for holding a sample rack (21) having a plurality of wells (22) in which sample containers (23) are to be set and a sample rack imager (27) for taking, directly from above or obliquely from above, an image of the sample rack (21) held in the sample rack holder (24), whereby an incorrect input of the position information of the sample container (e.g. the well number or rack number) into an analysis schedule table is prevented.