Provided are: an infrared temperature sensor which is reduced in film deformation and achieves higher accuracy, while ensuring reliability; and a device which uses this infrared temperature sensor. An infrared temperature sensor (1) is provided with: a film (3) which absorbs infrared light; a case (2) which covers and holds the film (3) so as to form airtight spaces (22c, 24b) between itself and the film (3), and which is provided with a light guide part (23) that has an opening (23a) and guides infrared light and a shielding part (24) that has a shielding wall (24a) and shields infrared light; ventilation means (11-17) which allow air permeation between the spaces and the outside; a heat-sensitive element (4) for infrared detection, which is arranged on the film (3) at a position that corresponds to the light guide part (23); and a heat-sensitive element (5) for temperature compensation, which is arranged on the film (3) at a position that corresponds to the shielding part (24).