A method for manufacturing a sensor element for use in a gas sensor that measures a concentration of a predetermined gas component in a measurement gas, said sensor element comprising an electrochemical pumping cell including: an oxygen-ion conductive solid electrolyte layer; a first electrode that is formed on a surface of said oxygen-ion conductive solid electrolyte layer; and a second electrode that is formed in a space provided inside said oxygen-ion conductive solid electrolyte layer, said method comprising the steps of: a) forming, by printing, a wiring pattern of a conductive paste on a green sheet containing, as a main component, ceramic which is an oxygen-ion conductive solid electrolyte, said wiring pattern including portions serving as said first electrode and said second electrode; b) laminating a plurality of green sheets that have been subjected to said step a), and integrating said plurality of green sheets; c) cutting out a plurality of element bodies from a laminated body obtained by said step b); d) baking the element body cut out by said step c); e) heating the element body having been subjected to said step d), in a reducing atmosphere: characterized in that f) by an external power source, applying a voltage between said first electrode and said second electrode included in the element body having been subjected to said step e), to thereby decompose and remove an atmosphere gas of said step e) attached to said second electrode; and g) inspecting electrical characteristics of the element body having been subjected to said step f). an oxygen-ion conductive solid electrolyte layer; a first electrode that is formed on a surface of said oxygen-ion conductive solid electrolyte layer; and a second electrode that is formed in a space provided inside said oxygen-ion conductive solid electrolyte layer, said method comprising the steps of: a) forming, by printing, a wiring pattern of a conductive paste on a green sheet containing, as a main component, ceramic which is an oxygen-ion conductive solid electrolyte, said wiring pattern including portions serving as said first electrode and said second electrode; b) laminating a plurality of green sheets that have been subjected to said step a), and integrating said plurality of green sheets; c) cutting out a plurality of element bodies from a laminated body obtained by said step b); d) baking the element body cut out by said step c); e) heating the element body having been subjected to said step d), in a reducing atmosphere: a) forming, by printing, a wiring pattern of a conductive paste on a green sheet containing, as a main component, ceramic which is an oxygen-ion conductive solid electrolyte, said wiring pattern including portions serving as said first electrode and said second electrode; b) laminating a plurality of green sheets that have been subjected to said step a), and integrating said plurality of green sheets; c) cutting out a plurality of element bodies from a laminated body obtained by said step b); d) baking the element body cut out by said step c); e) heating the element body having been subjected to said step d), in a reducing atmosphere: characterized in that f) by an external power source, applying a voltage between said first electrode and said second electrode included in the element body having been subjected to said step e), to thereby decompose and remove an atmosphere gas of said step e) attached to said second electrode; and g) inspecting electrical characteristics of the element body having been subjected to said step f). f) by an external power source, applying a voltage between said first electrode and said second electrode included in the element body having been subjected to said step e), to thereby decompose and remove an atmosphere gas of said step e) attached to said second electrode; and g) inspecting electrical characteristics of the element body having been subjected to said step f).