PROBLEM TO BE SOLVED: To provide a combination cell preparation for hematopoietic stem cell transplantation, an engraftment promoter, and a method for producing thereof.SOLUTION: The invention provides a combination cell preparation for hematopoietic stem cell transplantation comprising a combination of cord blood of a donor with any of 0-2 antigen mismatch in MHC matching to a recipient, and cord blood of at least one donor from which at least immune cells are substantially removed.COPYRIGHT: (C)2015,JPO&INPIT