The meaning of belief in a just world and students' subjective experience of the justice of their teachers' behavior toward them personally for academic achievement was examined. Sample 1 involved 947 secondary school students from 67 classes (grade levels 9 to 11), and Sample 2 718 students from 48 classes (grade level 9). Multilevel analyses revealed that the more the students believed in a personal just world, the more they felt their teachers' behavior toward them personally to be just and the better grades they received; the association between BJW and student achievement was fully mediated by teacher justice experience. It was concluded that personally experienced teacher justice is a key feature of a school environment that is conducive to student achievement. (Contains 1 figure and 4 tables.)