Angular distributions for ¹⁵N elastically scattered from ^10;11B nuclei were measured at the energy of 43 MeV. The experimental data for the ¹¹B+¹⁵N system showed a remarkable increase in differential cross sections at large angles which cannot be explained within the framework of the optical model. Such behavior of the cross sections can be reproduced only by taking into account the contribution of the α-cluster transfer mechanism. Although the experimental data for ¹⁰B+¹⁵N system showed an increase in differential cross sections at backward angles, it can be described by optical model calculations.