The purpose of the present invention is to provide pluripotent cells that are highly safe in applications for regenerative medicine, and a method for producing the same. Another purpose of the present invention is in particular to provide pluripotent cells that pose fewer problems with respect to malignant transformation of cells and that arouse less concern about safety regarding the presence of bacteria inside cells, and a method for producing the same. The present invention provides a method for producing pluripotent cells from somatic cells. This method includes a step for inducing reprogramming of cells by bringing a ribosome fraction of biological origin into contact with somatic cells. The present invention also provides a composition for inducing cell reprogramming, the composition including a ribosome fraction of biological origin.
