An infrared detection device comprising at least one gas detection device (11, 114, 116) that comprises at least: - a resistive layer, at least a first portion of which is able to emit a first infrared radiation in a first range of wavelengths able to be absorbed by the gas or gases to be detected, and at least a second portion of which is able to absorb said first infrared radiation after absorption by the gas or gases to be detected and to produce heat and is thermally coupled to at least one first thermoresistive transduction element which is arranged on the second portion of the resistive layer; - a substrate comprising at least one first electronic circuit (110, 1104, 1106) for controlling and reading the gas detection device (11, 114, 116); - portions of electrically conductive material electrically connecting at least the first portion of the resistive layer and the first thermoresistive transduction element to the first electronic circuit (110, 1104, 1106), and providing mechanical holding of the first portion and second portion of the resistive layer opposite the substrate so that a distance between the first portion of the resistive layer and the substrate is substantially equal to a distance between the second portion of the resistive layer and the substrate; the infrared detection device further comprising a matrix of infrared detectors able to produce a two-dimensional infrared representation to analyze or detect movements and such that each infrared detector comprises at least: - a third portion of the resistive layer able to absorb a second infrared radiation in a second range of wavelengths intended to be detected and to produce heat, said third portion being thermally coupled to at least a second thermoresistive transduction element which is arranged on the third portion of the resistive layer; - portions of electrically conductive material electrically connecting the second thermoresistive transduction element to a second electronic circuit (110, 1102) controlling and reading the matrix of infrared detectors implemented in the substrate, and providing mechanical holding of the third portion of the resistive layer opposite the substrate such that a distance between the third portion of the resistive layer and the substrate is substantially equal to the distance between the second portion of the resistive layer and the substrate, in which the portions of electrically conductive material form pillars which mechanically hold the first, second and third portions (25a, 25b, 25c) of the resistive layer. - a resistive layer, at least a first portion of which is able to emit a first infrared radiation in a first range of wavelengths able to be absorbed by the gas or gases to be detected, and at least a second portion of which is able to absorb said first infrared radiation after absorption by the gas or gases to be detected and to produce heat and is thermally coupled to at least one first thermoresistive transduction element which is arranged on the second portion of the resistive layer; - a substrate comprising at least one first electronic circuit (110, 1104, 1106) for controlling and reading the gas detection device (11, 114, 116); - portions of electrically conductive material electrically connecting at least the first portion of the resistive layer and the first thermoresistive transduction element to the first electronic circuit (110, 1104, 1106), and providing mechanical holding of the first portion and second portion of the resistive layer opposite the substrate so that a distance between the first portion of the resistive layer and the substrate is substantially equal to a distance between the second portion of the resistive layer and the substrate; - a third portion of the resistive layer able to absorb a second infrared radiation in a second range of wavelengths intended to be detected and to produce heat, said third portion being thermally coupled to at least a second thermoresistive transduction element which is arranged on the third portion of the resistive layer; - portions of electrically conductive material electrically connecting the second thermoresistive transduction element to a second electronic circuit (110, 1102) controlling and reading the matrix of infrared detectors implemented in the substrate, and providing mechanical holding of the third portion of the resistive layer opposite the substrate such that a distance between the third portion of the resistive layer and the substrate is substantially equal to the distance between the second portion of the resistive layer and the substrate,