Provided is a thin film-laminated film which is obtained at low cost, and which still has high chemical stability and is suitable for use as an electrode film for a strip for blood sugar level sensors. A thin film-laminated film which is obtained by sequentially laminating, on at least one surface of a film base, a titanium thin film and a carbon thin film in this order. With respect to this thin film-laminated film, the film thickness of the titanium thin film is preferably 10-400 nm and the film thickness of the carbon thin film is preferably 0.2-50 nm. A strip for blood sugar level sensors, which uses this thin film-laminated film. A blood sugar level sensor device which uses this strip for blood sugar level sensors.
