As is well known, massive stars, which would be the progenitor of type II supernovae, are rapid rotators. It is obviously necessary to investigate the effects of rotation on gravitational collapse of stellar cores and supernova explosions. We review (i) rotational core collapse, (ii) jet-like explosion induced by rotation and asymmetric neutrino emission from proto-neutron-stars, and (iii) explosive nucleosynthesis when an asymmetric jet-like explosion occurs, based on our recent work.