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Resistance spot welding is a major welding method for assembling automobiles. Automotive bodies comprise 300 to 400 pieces of press-formed parts, which are assembled by 3 000 to 5 000 spot welds. To achieve lighter automotive bodies and higher safety improvement against collision, the application of high strength steel sheets in automotive bodies has increased recently. However, the fatigue strength of spot welded joints in steel sheets has been reported to be generally identical irrespective of the tensile strength of the steel sheets.1–3) The fatigue strength of the spot welded joints deteriorates when thinner steel sheets are used. To enable the use of thinner high strength steel sheets for parts that require high fatigue resistance, the fatigue strength of spot welded joints needs to be improved. In the case of fillet welded joints by arc welding, several methods have been proposed to improve the fatigue strength of the welded joints, including reducing the stress concentration by finishing the toe of the weld beads with a grinder,5) using low temperature transformation welding wires to impose compressive residual stress,6) and reducing the stress concentration by applying an ultrasonic impact treatment to the weld bead toes.7) All of these methods directly address the weld toe of the beads where fatigue Improvement of Fatigue Properties of Resistance Spot Welded Joints in High Strength Steel Sheets by Shot Blast Processing