Social behaviors are among the most notable motivated behaviors that are driven by rewarding goals. However, how dopamine (DA), a reward signal, releases during social behaviors has been unclear. This study used a genetically encoded DA sensor, GRAB_DA2m, to record DA activity in the nucleus accumbens (NAc) core during various social behaviors in male and female mice. They performed optical recording of DA signal by virally expressing Cre-dependent GRAB_DA2m bilaterally in the NAc core of Drd1-Cre mice. This dataset includes fiber photometry, behavioral, and immunohistochemistry data. These results provide complex information encoded by NAc DA activity during social behaviors and their multistage functional roles.