PROBLEM TO BE SOLVED: To provide a method for producing tomato seedlings of which radioactive cesium concentration is reduced than ever before, even when the tomato seedlings are grown in a field contaminated with radioactive cesium without large scale decontamination.SOLUTION: Provided is a method for producing tomato seedlings with reduced radioactive cesium concentration, where the tomato seedlings are inoculated with a strain of Veronaeopsis simplex (Accession Number: NITE AP-01933).SELECTED DRAWING: None