An electroconductive film (101) comprises a metal thin-film (10) on a first main surface of a flexible substrate (40) that includes a resin film (5). The thickness of the flexible substrate is 1 mm or less. The absolute value |H2−H1| of the difference between the heating dimensional change rate H1 of the electroconductive film and the heating dimensional change rate H2 of a film obtained by removing the metal thin-film from the electroconductive film is preferably 0.10% or less. There is a tendency that undulation of a temperature sensor film after patterning of the metal thin-film is further suppressed as the value of |H2−H1| decreases.