Abstract: Provided is an apparatus for detecting microorganisms, including: a sample accommodation container having an accommodation space in which a measurement sample in which a number of living microorganisms is to be counted is accommodated; an electrode portion installed at the sample accommodation container so as to apply electrical stimulation to the microorganisms of the sample accommodated in the accommodation space; a current applying control portion that is capable of controlling a current applied by the electrode portion; and an image processor that captures an image of the sample accommodated in the sample accommodation container and counts the number of living microorganisms.