Gas sensor and method for manufacturing gas sensor

A gas sensor characterized by comprising:

• an electrode portion which includes one or more electrode pairs each having a first electrode and a second electrode, the first electrode and the second electrode being opposed to each other in a first direction in the electrode pair, with a gap formed therebetween;
• a sensitive membrane disposed between the first electrode and the second electrode in the electrode pair;
• and
• a voltage application section which applies a voltage to the electrode portion such that the voltage is applied between the first electrode and the second electrode,
• wherein, when the product of an inter-electrode distance in the first direction between the first electrode and the second electrode and an electrode area of the first electrode in a cut surface orthogonal to the first direction is defined as an inter-electrode volume, a division value obtained by dividing, by the inter-electrode volume, the voltage applied to the electrode portion by the voltage application section is greater than 4.2×1016 V/m3 and not greater than 2.0×1025 V/m3 and
• wherein the electrode area is equal to or greater than 2.5×10−15 m2.