An objective of the present invention is to provide a tubular sensor capable of carrying out high-accuracy constituent detection and that is easy to manufacture, as well as a constituent measuring device and a method of manufacturing the tubular sensor. Accordingly, the present invention provides a tubular sensor including: a tubular body having a cavity extending through the tubular body in a longitudinal direction thereof an insulation layer formed on an inner wall surface of the tubular body and a plurality of electrodes formed on the insulation layer in the longitudinal direction of the tubular body, and extending continuously from one end to the other end of the tubular body. The present invention further provides a constituent measuring device which employs the tubular sensor. In addition, the tubular sensor is manufactured via the steps of: 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 having the insulation layer and the electrodes formed thereon and forming a plate-shaped body which has a development shape of the tubular body having the cavity extending through the tubular body in the longitudinal direction thereof in a state in which the thin metal sheet and the plate-shaped boy are partially connected and press working the plate-shaped body to form the tubular body.
