Sensor

A sensor comprising:

• a detector element that extends in an axial direction and has a shape of a plate having two opposing principal surfaces, the detector element including a detecting portion at a front side in the axial direction and an element back portion at a back side in the axial direction, the detecting portion detecting a specific gas component contained in measurement target gas, the element back portion having two or more electrical connection terminal portions formed on one of the principal surfaces;
• two or more connection terminals which each include an oblong frame main body that extends in the axial direction and an element contact portion that is bent at a front end portion of the frame main body so as to extend toward the back side and that is electrically connected to a corresponding one of the electrical connection terminal portions;
• a separator that accommodates the connection terminals and the element back portion;
• and
• a base that surrounds an outer periphery of the separator,
• wherein the separator includes a partition wall that is made of a resin material and completely partitions a plurality of accommodation spaces from each other, and
• wherein the accommodation spaces include an element accommodation space that accommodates portions of the element contact portions and the element back portion, and a plurality of terminal accommodation spaces which each accommodate one of the two or more frame main bodies.