The results of experiments with transparent easy-plane antiferromagnetic iron borate (FeBO[sub 3]) show that nuclear magnetic resonance (NMR) offers an effective tool for the study of photomagnetism in magnetically ordered materials. It is established that illumination of a FeBO[sub 3] sample leads to a shift of the [sup 57]Fe NMR frequency due to a change in the electron magnetization and significantly increases the nuclear induction signal intensity in the range of existence of the domain boundaries.