The invention relates to an electrochemical gas sensor (9) which is improved with regard to the electrochemical measurement properties and the tightness of the housing (4) for an electrolyte at the points of passage of the connecting lines (11, 21, 31), characterized by a housing (4), comprising at least one measuring electrode (1) and a counterelectrode (2) and with electrical connection lines (11, 21, 31) from the electrodes (1, 2, 3) to a measuring unit (8) arranged outside the housing (4), wherein the electrical connection lines (11, 21, 31) at least partially in the housing (4) in the field of electrolyte wetting consist of carbon nanotubes (CNT, carbon nanotubes).
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