Recent studies on nuclear structure by using radioactive isotope beams available at the RIKEN projectile-fragment separator (RIPS) are introduced. Special emphasis is given to experiments selected from recent programs that highlight studies; the particle stability of very neutron-rich nuclei, 34Ne, 37Na and 43Si, the nuclear structure of 27F, 30Ne and 34Si at N ∼ 20, and the anomalous quadrupole transition in 16C.