The following study has been made for how long inner ear cells survive after the decapitation. The cochlea of decapitated guinea pig was taken out and, after definite hours, was inserted into suitable environments such as cisterna magna, camera oculi, cavum abdo- minalis and nape-muscle of living guinea pig, where it was preserved for certain hours, , and then the morphological changes 6 hours after the death of the animal was in- spected. It was generally observed that the group, that was inserted into the suitable environments earlier, showed the changes the later, compared with the control group which was preserved in normal saline at 37- C for 6 hours wrapping with the retarda- tion of the postmortem changes indicate the survival of the cells when they were in- serted into the above mentioned suitable environments. A considerable number of spiral ganglion cells are able to survive for 3 hours spiral limbus cells almost for 4∼5 hours, and Deiters's cells, Hensen's cells, stria vas- cularis and Reissner's membrane for 3∼4 hours after decapitation of the animal.The other cells survive indefinitely.