To surely adsorb the gas generated in a envelope without necessity of a getter.

An envelope 3 of an FED 2 has a front board 4 and a rear board 5 in opposition and a spacer member 6 at the periphery. There is a band- shaped anode 9 consisting of a translucent anode conductor 7 and a phosphor 8 at the internal surface of the front board 4. An electric field emitting element 1 made at the internal surface of the rear board 5 has a cathode conductor 10, an insulating layer 11, a gate 12, and an emitter 14 within a cavity 13. A pole 15b is brought into contact with the front board 4 among the band- shaped anodes 9, and into contact with the insulating layer 11 among the band- shaped gates 12. The pole 15b is constituted by depositing a unevaporative getter to the surface of the core consisting of carbon fibers large in tensile strength and in adsorption. The pressure-resistant strength of the envelope 3 is high. Since the poles 15b are arranged in large numbers in the vicinity of the anode 9 or the electric field emitting element 1, they can surely adsorb the gas generated within the envelope 3, in the vicinity of the gas occurrence position. A getter chamber is not needed.