Pipe structure and aircraft

A pipe structure comprising:

• a pipe through which a gaseous body having a higher temperature than a temperature of a surrounding atmosphere flows;
• a cover that covers an outer peripheral portion of the pipe, and defines a plurality of vents from which the gaseous body leaking from the pipe flows out;
• and
• a heat-transfer member that is interposed between a line-shaped sensor that passes a position corresponding to each of the plurality of vents, and is sensitive to a temperature of a gaseous body outside the cover, and one of the plurality of vents, and transfers heat of the gaseous body flowing out from said one of the plurality of vents to the sensor, and the heat-transfer member has a smaller thickness than a diameter of said one of the plurality of vents.