The aim of the current study was to investigate the validity of the Japanese version of the SOSS. We translated the 58 SOSS items into Japanese, after receiving permission from the creator. A total of 1909 individuals from the general public, who were not suicide bereaved, responded to the Japanese version of the SOSS through an internet survey. The factor structure observed was similar to prior research. Cronbach’s α for the three factors demonstrated appropriate internal consistency. The Japanese version of the SOSS was confirmed through factor analysis to be valid and reliable.