A method for testing drug response of a cardiomyocyte, the method comprising: testing a response of the cardiomyocyte to an added drug in a culture medium under a condition in which a distance from a liquid surface of the culture medium to a bottom surface of a culture vessel contacted by the cardiomyocyte is 5.0 mm or less; or testing a response of the cardiomyocyte to an added drug immediately after placing the cardiomyocyte in a culture medium under a condition in which a distance from a liquid surface of the culture medium to a bottom surface of a culture vessel contacted by the cardiomyocyte is 5.0 mm or less.