Patent ID: 8689609

Claim:
A gas sensor, comprising: a cylindrical member which includes a gas detection chamber therein and extends along an axis thereof; a base member which closes an opening of a first axial end of the cylindrical member; a status sensor which is disposed at a substantially central portion of the base member, and detects at least the temperature or the humidity in the gas detection chamber; a plurality of gas detection elements disposed around the status sensor on the base member; a lid member which closes an opening of a second axial end of the cylindrical member; and a plurality of gas inlet ports which penetrates the lid member and enables the introduction of an inspection target gas from an outside into the gas detection chamber, wherein all of the plurality of gas inlet ports are arranged at locations not coinciding with the status sensor and the gas detection element when viewed from the axial direction, the plurality of the gas detection elements are arranged on a first circumference; the plurality of the gas inlet ports are arranged on the first circumference or on a second circumference of a different diameter from that of the first circumference; and the plurality of the gas detection elements arranged on the first circumference and the plurality of the gas inlet ports arranged on the first circumference or the second circumference are positioned in different phases along the circumferential direction.