An oxygen measuring electrode assembly for measuring an oxygen partial pressure in arterial blood in which a cylindrical anode and cathode are disposed coaxially in an insulator in such way that the former is placed in the latter. The end surfaces of said electrodes contact with the body surface via an electrode membrane which covers said electrodes with a suitable tension and holds an electrolyte solution layer on said electrode surfaces. Said electrode membrane is fixed on an annular end portion of a cylindrical holder of an electrically and thermally insulating material which surrounds said anode. A metal collar surrounding said holder bears a membrane-covering metal plate which has an opening through which an area of said electrode membrane is exposed to the body surface. Said membrane cover plate, which is connected to said collar and controlled to keep a desired temperature, heats said body surface and activates the blood capillary, that is arterializes the subcutaneous tissue. Thus the electrode can detect the arterial oxygen partial pressure.
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