An infrared sensor device comprising: a mounting substrate having a plurality of substrate-side wirings (14A, 14B) patterned on the surface thereof; and an infrared sensor mounted on the surface of the mounting substrate and connected to the substrate-side wirings (14A, 14B); the infrared sensor comprising: an insulating film; a first heat sensitive element and a second heat sensitive element provided on one face of the insulating film so as to be spaced apart from one another; a first conductive wiring film and a second conductive wiring film that are formed on the one face of the insulating film and are respectively connected to the first heat sensitive element and the second heat sensitive element; an infrared reflecting film provided on the other face of the insulating film so as to face the second heat sensitive element; a terminal support body, made of a resin, arranged at the one face side, wherein a gap is provided between the terminal support body and the insulating film; and a plurality of mounting terminals provided to the terminal support body, wherein lower portions of the mounting terminals are provided so as to protrude below a bottom face of the terminal support body and to form a space between the terminal support body and the mounting substrate the mounting terminals extend from an upper face to the bottom face of the terminal support body opposite to the insulating film and have support convex parts protruding from the upper face to the insulating film, and wherein the support convex parts are connected to the corresponding first and second wiring films (4a, 4B), and are arranged in the gap to support the insulating film. a mounting substrate having a plurality of substrate-side wirings (14A, 14B) patterned on the surface thereof; and an infrared sensor mounted on the surface of the mounting substrate and connected to the substrate-side wirings (14A, 14B); the infrared sensor comprising: an insulating film; a first heat sensitive element and a second heat sensitive element provided on one face of the insulating film so as to be spaced apart from one another; a first conductive wiring film and a second conductive wiring film that are formed on the one face of the insulating film and are respectively connected to the first heat sensitive element and the second heat sensitive element; an infrared reflecting film provided on the other face of the insulating film so as to face the second heat sensitive element; a terminal support body, made of a resin, arranged at the one face side, wherein a gap is provided between the terminal support body and the insulating film; and a plurality of mounting terminals provided to the terminal support body, wherein lower portions of the mounting terminals are provided so as to protrude below a bottom face of the terminal support body and to form a space between the terminal support body and the mounting substrate the mounting terminals extend from an upper face to the bottom face of the terminal support body opposite to the insulating film and have support convex parts protruding from the upper face to the insulating film, and wherein the support convex parts are connected to the corresponding first and second wiring films (4a, 4B), and are arranged in the gap to support the insulating film. an insulating film; a first heat sensitive element and a second heat sensitive element provided on one face of the insulating film so as to be spaced apart from one another; a first conductive wiring film and a second conductive wiring film that are formed on the one face of the insulating film and are respectively connected to the first heat sensitive element and the second heat sensitive element; an infrared reflecting film provided on the other face of the insulating film so as to face the second heat sensitive element; a terminal support body, made of a resin, arranged at the one face side, wherein a gap is provided between the terminal support body and the insulating film; and a plurality of mounting terminals provided to the terminal support body, wherein lower portions of the mounting terminals are provided so as to protrude below a bottom face of the terminal support body and to form a space between the terminal support body and the mounting substrate the mounting terminals extend from an upper face to the bottom face of the terminal support body opposite to the insulating film and have support convex parts protruding from the upper face to the insulating film, and wherein the support convex parts are connected to the corresponding first and second wiring films (4a, 4B), and are arranged in the gap to support the insulating film.