The purposes of this study were to investigate the constructs of teacher efficacy for teachers of students with mental retardation. Through 3 focus group interviews, 15 teachers were interviewed about teacher efficacy that they perceived. The results indicated that teacher efficacy included: personal teaching competency, problem-solving abilities, abilities of self-adjustment, cooperative abilities with parents, colleges and school administrators, respectively. Some of the constructs of teacher efficacy in this study are similar to the research findings, but some are different.