The Purpose of this study was to investigate infant/toddler teacher's recognition of professionalism in relation to their job stress by demographic variables. Subjects of this study were 202 infant/toddler teachers in Seoul Metropolitan City and Gyeonnggi Province. They responded to 'Teachers recognition of professionalism Scale' and 'Teacher's Job stress Scale'. The collected data were analyzed by one way ANOVA, Pearson's partial correlation, Scheffe test for post hoc test and cronbach's α for reliability with SPSS PC program. The results are as follows. First, professionalism recognition degree of teachers appeared to be over average in overall. And job stress the teachers feel appeared to be under average in overall. Second, recognition of professionalism was high in teachers with high school diploma, those in national child care centers, higher salaried, those who are over 30 years old, and those married. Also, job stress level was high in teachers with those who are under 25 years old, those with experience of less than 1 year, and graduates. Third, the relation between recognition of professionalism and infant/toddler teacher's job stress was negative correlation which means that they had the lower recognition on professionalism in their roles as their teacher's job stress is higher.