To provide a manufacturing method of an electron emitting element with a low driving voltage and capable of uniformizing electron emitting characteristics.

A manufacturing method of an electron emitting element having a cathode substrate and an anode substrate disposed in a vacuum via a spacer and an electron emitting source formed on the cathode substrate includes the steps of applying active treatment to a surface of the electron emitting source and burning the electron emitting source in a temperature range of 400 to 500°C after the activation treatment.