The present invention provides a living body healing, having an accelerating activity in the regeneration ability relating to the cure of damages of cells or tissues caused by toxicity of a drug or a wound in a living body, having high safety, and also not causing any side effect even administered for a long period of time. Problems are solved by a living body healing accelerator containing as an active constituent a mixture of a culture solution obtained after cultivation of a microorganism belonging to the Aureobasidium sp. and mycelia of the microorganism cultivated in the culture solution. The living body healing accelerator of the present invention is preferable used for reducing side effects of an anticancer drug, preferably used for acceleration of healing of a wound, and in addition, preferably used for acceleration of normalization of a blood glucose level and for alleviating a pathological state of leukemia.