It is an object of the present invention to manufacture a conductive film with a small shape fluctuation at a high stability and a high reproducibility by using the ink jet system. It is another object of the present invention to provide an electron-emitting device having a preferable electron-emitting characteristic, an electron source in which a plurality of preferable electron-emitting devices having a high uniformity are arranged, and an image-forming apparatus having a high uniformity and a preferable display quality. It is still another object of the present invention to provide inexpensive electron-emitting device, electron source, and image-forming apparatus at a high yield. The present invention is characterized by providing an electron-emitting-device manufacturing method comprising the steps of supplying a liquid containing a conductive-film-forming material so as to connect a pair of electrodes arranged on a substrate each other, forming a conductive film by heating the substrate to which the liquid is supplied and forming an electron-emitting portion by applying a voltage between the electrodes, wherein the liquid uses a solvent containing nitrogen as a main solvent.