Abstract: A method for cryopreservation of cells characterized by the use of a solution containing, as essential components, a sodium salt, a potassium salt, a saccharide, a cryoprotectant, and a hydrogencarbonate salt and/or a carbonate salt, the solution further optionally containing a component selected from the group consisting of proteins, magnesium salts, and calcium salts. According to the present invention, a method for cryopreservation of cells capable of maintaining a high viability rate after thawing, and a cryopreservation solution used in the cryopreservation are provided. In addition, by using the method for cryopreservation, the cells can be preserved in a state of maintaining a high viability rate even after thawing, and also maintaining their physiological functions; further, a cell washing step after freezing and thawing is unnecessary, thereby making it very useful in the fundamental researches of cells and the application studies on the medical treatment.