PROBLEM TO BE SOLVED: To provide a measurement device, a measurement method and a supply device for calculating density of an object substance in a body fluid, in a chronological state based on a measured current value, which are capable of more accurately measuring density of the object substance even when temperature of the body fluid in the vicinity of the portion where the current value is measured.SOLUTION: A measurement device 101 of the invention comprises: a detection part 300 comprising a conductive layer (current measurement part) for measuring a current which is varied according to density of the object substance； a temperature sensor (temperature measurement part) for measuring environmental temperature of an environment where the conductive layer is disposed: a storage part 261 for storing a calibration curve of a current variation width due to deviation (Δt) of the environmental temperature and set temperature, and the density of the object substance, as plural combinations； and a calculation part 200 for determining the density of the object substance based on the deviation (Δt) of the environmental temperature and set temperature, the current value and the calibration curve.SELECTED DRAWING: Figure 7【課題】体液中の被対象物質の濃度を、測定された電流値に基づいて経時的に算出する測定装置、測定方法および供給装置において、電流値を測定する近傍の体液の温度が変動したとしても、より優れた精度で被対象物質の濃度を測定することができる測定装置、測定方法および供給装置を提供すること。【解決手段】本発明の測定装置１０１は、被対象物質の濃度によって変動する電流を測定する導電層（電流計測部）を備える検出部３００と、前記導電層が留置される環境の環境温度を測定する温度センサー（温度計測部）と、前記環境温度の設定温度とのずれ（Δｔ）による電流変動幅と、前記被対象物質の濃度との検量線を複数の組み合わせとして記憶する記憶部２６１と、前記環境温度の設定温度とのずれ（Δｔ）と前記電流値と前記検量線から前記被対象物質の濃度を導く演算部２００と、を備える。【選択図】図７
