The aim of the study, which is designed based on survey model, is to measure whether the TPACK confidence makes a significant difference in terms of determined variables in the study. The research group consists of 201 teachers working as textbook authors in the textbook writing commissions in the 2022-2023 academic year. Data collected using "Personal Information Form" and "Technological Pedagogical Content Knowledge Confidence Survey" were analyzed by using t-test and one-way ANOVA tests. The results showed that the participants have a mid-level of confidence in TPACK. In addition, the results showed that while The TPACK confidence level didn't differ significantly by gender, age and experience (both in teaching profession and textbook writing commission); branches and the status of taking a course about using technology caused significant differences in some sub-dimensions of TPACK confidence level.