The purpose of this study was to investigate the relationships between the pedagogical
content knowledge in science teaching of pre-service early childhood teachers and their
attitude toward science and science teaching efficacy belief. A total of 294 pre-service
early childhood teachers responded to a questionnaire that examined their pedagogical
content knowledge in science teaching, attitude toward science, and science teaching
efficacy belief. The results of this study were as follows: First, teachers had average
pedagogical content knowledge in science teaching. The groups of 3rd and 4th grades
were significantly higher than the 2nd grade group. Second, the teachers' recognition was
below average in attitude toward science and science teaching efficacy belief. The groups
of 3rd and 4th grades were significantly higher than the 2nd grade group. Third, a
meaningful statistical relationship was found between the pedagogical content knowledge
in science teaching of pre-service early childhood teachers and their attitude toward
science and science teaching efficacy belief. As the score of pre-service early childhood
teachers in pedagogical content knowledge in science teaching became higher, the score
in attitude toward science and science teaching efficacy belief became higher.