The purposes of this study were to: 1) identify instructional leadership of teachers, 2) develop the Instructional leadership indicators of teachers, 3) investigate the goodness-of-fit between the structural model of instructional leadership indicators of teachers and empirical data, and 4) produce a user manual of the instructional leadership indicators of teachers in educational opportunity expansion schools under the Primary Educational Service Area Offices in the northeast. The study was divided into four phases. The findings were as follows 1. The components of instructional leadership of teachers in educational opportunity expansion schools consisted of seven components, namely 1) self and other teacher development, 2) curriculum development ability, 3) learning management ability, 4) learning assessment and evaluation ability, 5) transformational leadership, 6) learning exchange ability and 7) moral and ethics. 2. The indicators of instructional leadership of teachers in educational opportunity expansion schools comprised seven principal components, 25 sub-components and 98 indicators. All principal components achieved the mean scores at high level of appropriateness 3. The indicator structural model of instructional leadership of teachers in educational opportunity expansion schools was congruent with empirical data. (Chi-Square=202.84, df=176, p=0.08095, GFI=0.97, AGFI =0.95, RMSEA=0.016, CN=668.53) and 4. The user manual of the instructional leadership of teacher indicators in educational opportunity expansion schools under the Primary Educational Service Area Offices in four aspects obtained the Index of item-objective congruence (IOC) at 1.00 indicated that the user manual was appropriated to be implemented.