The purpose of this study was to investigate the dual readership represented in the use of picture books. The study was conducted through in-depth interviews and observation of 9 families including 5-year-olds. The findings of this study were as follows. First, mothers exercised their exclusive right to choose books for their children. They usually used online bookstores, libraries, or book rental shops by consulting other mothers or merchandisers. On the other hand, fathers and children seldom involved themselves in the selection of picture books. Second, children preferred interesting books, while mothers favored complete series of books, which were usually for educational purposes. Third, dynamic interaction between mother and child was occurred during their daily routine of reading picture books together. Five-year-olds seemed to be transitioning into independent readers, and mothers showed that they were also readers of picture books when they appreciated and enjoyed them.