Patent ID: 7260979

Claim:
An oxygen sensor, comprising: a sensor element which senses an oxygen concentration and convert it to an electric signal; a holder having a hole through which the sensor element is arranged; a sealing positioning portion which seals a clearance between the sensor element and the holder and positions the sensor element in the holder, the sealing positioning portion being filled with a ceramic powder; terminals arranged to be in contact with the sensor element, the terminals taking an output from the sensor element; an insulator secured to the holder at a first end, the insulator holding the terminals; a casing secured to the holder at the first end, the casing covering an outer periphery of the insulator; and a protector secured to the holder at a second end, the protector covering an outer periphery of a portion of the sensor element, the portion protruding from the second end of the holder, wherein the sealing positioning portion comprises a space arranged at an overall outer periphery of the hole of the holder and having the ceramic powder charged therein, and a first caulking arranged in a vicinity of the space.