▎ 摘　　要

NOVELTY - Sensor has a target substance uptake unit (3) that brings an acetylcholine aqueous solution into contact with a gas sample to dissolve a target substance in the gas sample into the acetylcholine aqueous solution. A reaction unit (5) holds acetylcholinesterase and brings the solution delivered from the target substance uptake unit into contact with the acetylcholinesterase. A detection unit (7) measures a change in an amount of acetylcholine decomposition product produced in the solution delivered from the reaction unit. USE - Sensor for detecting a target substance in gas a sample. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are also included for: (1) a method for detecting a target substance in a gas sample which involves: (a) contacting an acetylcholine aqueous solution into contact with a gas sample; (b) mixing and contacting the acetylcholine aqueous solution in contact with the gas sample and acetylcholinesterase; and (c) measuring a change in an amount of acetylcholine decomposition product produced in the aqueous solution after mixing and contacting; and (2) a kit which comprises the sensor and a reagent containing acetylcholine and a reagent containing acetylcholinesterase. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of sensor. Target substance uptake unit (3) Reaction unit (5) Conduit (6) Detection unit (7) Pump (11)