Abstract: A welding electrode device with quick ejection of the worn out electrode comprises an extended hollow body (12, 112) in which a tubular pin (16, 116) is inserted, on which a jaw sleeve (19, 132) is assembled and which is extended in correspondence with an end opening (15, 109) of said hollow body (12, 112) able to contain the welding electrode; the pin (16, 121) has a rivet (28, 125) sliding into it and pushed towards said opening (15, 109) of the body by elastic means (29, 128); the sleeve (19, 132) has longitudinal grooves (21, 134) obtained in correspondence with said end and has oblique inner (22, 136) and outer (24, 133) walls which cooperate with corresponding inner (14, 115) and outer walls respectively (27, 121) of the body and of the pin, in order to expand in the grooved portion (21, 134) during its movement on the pin (16, 121) due to the action of a pushbutton (31, 138, 129) connected to it and held by the cover in such a way to be manually pressed from the exterior; power feeding means to the ele