An elevator electronic safety system in which reliability of malfunction check can be improved by performing a malfunction check on memory data, an address bus, and a data bus. A check on the address bus and the data bus is executed periodically by a hardware circuit and software processing, and a memory data malfunction check circuit. A designated address and designated data for checking able to verify both cases of “0” and “1” for each of all bit signals on the address bus and the data bus that are used in a memory system are input to or output (the address is only output) from a CPU periodically. For the address bus, plural designated addresses are detected by a designated address detection circuit, and if all the designated addresses cannot be detected, it is determined that the address bus is in malfunction. For the data bus, plural pieces of designated data are once written into and then read out from memories to make a comparison between the pieces of data before and after writing with each other, and if all the pieces of data do not coincide with one another, it is determined that the data bus is in malfunction.