Disclosed are inducible cancer stem cells which are capable of in vitro self-replication and which are useful in research into cancer treatment and cancer-related drug development. Also disclosed are a production method for the above cells, cancer cells induced from the above stem cells, and a practical application of the cells. The disclosed inducible cancer stem cells which are capable of in vitro self-replication are characterised by satisfying requirements (1) and (2): (1) expressing six genes (POU5F1 gene, NANOG gene, SOX2 gene, ZFP42 gene, LIN28 gene, and TERT gene) selected from among a specified gene group; (2) (a) having an abnormality which is either the modification of an endogenous cancer suppression gene, or (b) the up-regulation of an endogenous cancer related gene.