A tubular sensor includes a tubular body having a longitudinally extending cavity, an insulation layer formed on the inner wall surface of the tubular body and a plurality of longitudinally extending electrodes formed on the insulation layer and extending continuously from one end to the other end of the tubular body. The tubular sensor can be employed in a constituent measuring device. The tubular sensor can be manufactured by forming the insulation layer on a thin metal sheet, forming the plurality of electrodes on the insulation layer in stripes, cutting the thin metal sheet with the insulation layer and the electrodes formed thereon to produce a plate-shaped body having a development shape of the tubular body, and press working the plate-shaped body to form the tubular body.
