The present invention relates to a Petri dish for cultivating bacteria used for an isolation of the bacteria, an enrichment culture, a drug susceptibility test, etc. and the method of inspecting the drug susceptibility of the bacteria which are isolated from a clinical specimen etc. or purely cultured after their isolation, with the Petri dish being utilized. A mouth in the upper edge of the Petri dish proper is covered with at least one sheet and at least one small aperture is provided on the bottom of said Petri dish. If necessary, partitions the height of which reaches the distance between the bottom of the Petri dish and the sheet may be installed, and a sealing lid may be fitted in the small aperture. The method of the present invention, using the fractionized Petri dish possessing the pervious sheet as the cultivation surface, assorts the media different in kind from each other, the media being different in the kind of the contained drug from each other or the media containing the drugs which are same in kind, but different in the concentration from each other in each fraction, into which the bacteria are inoculated. |