Gas measuring device for a combustible gas, in particular natural gas, comprising: a main housing which defines a gas inlet and a gas outlet for the gas and bounds a housing interior between the gas inlet and the gas outlet; at least one connection element (14; 14'; 15; 15') which is arranged on the main housing in order to connect the gas inlet to a gas inlet line and to connect the gas outlet to a gas outlet line; a flow resistance element which is arranged between the gas inlet and the gas outlet in the housing interior and bounds a main channel for the gas flowing through the housing interior; a bypass channel which branches off from the main channel upstream of the flow resistance element and opens out into the main channel in the region of the flow resistance element or downstream of the latter; a thermal flow sensor for determining at least one characteristic variable of the combustible gas flowing through the main housing, wherein the thermal flow sensor is arranged adjacent to the bypass channel, wherein the main housing has a first bypass opening and a second bypass opening, wherein the bypass channel runs outside the main housing between the first and second bypass openings (16, 17), and wherein the thermal flow sensor is arranged outside the main housing, characterized in that the gas measuring device has a through-flow element which is arranged inside the main housing in such a manner that the entire combustible gas which is pushed through the gas measuring device flows through at least one section of the through-flow element, wherein the through-flow element comprises the flow resistance element, and in that the through-flow element has an exit opening upstream of the flow resistance element in order to allow a bypass flow to exit the through-flow element to the bypass channel, and has an entry opening in the region of the flow resistance element or downstream of the latter in order to allow the bypass flow to re-enter the through-flow element from the bypass channel. a main housing which defines a gas inlet and a gas outlet for the gas and bounds a housing interior between the gas inlet and the gas outlet; at least one connection element (14; 14'; 15; 15') which is arranged on the main housing in order to connect the gas inlet to a gas inlet line and to connect the gas outlet to a gas outlet line; a flow resistance element which is arranged between the gas inlet and the gas outlet in the housing interior and bounds a main channel for the gas flowing through the housing interior; a bypass channel which branches off from the main channel upstream of the flow resistance element and opens out into the main channel in the region of the flow resistance element or downstream of the latter; a thermal flow sensor for determining at least one characteristic variable of the combustible gas flowing through the main housing, wherein the thermal flow sensor is arranged adjacent to the bypass channel, wherein the main housing has a first bypass opening and a second bypass opening, wherein the bypass channel runs outside the main housing between the first and second bypass openings (16, 17), and wherein the thermal flow sensor is arranged outside the main housing, characterized in that the gas measuring device has a through-flow element which is arranged inside the main housing in such a manner that the entire combustible gas which is pushed through the gas measuring device flows through at least one section of the through-flow element, wherein the through-flow element comprises the flow resistance element, and in that the through-flow element has an exit opening upstream of the flow resistance element in order to allow a bypass flow to exit the through-flow element to the bypass channel, and has an entry opening in the region of the flow resistance element or downstream of the latter in order to allow the bypass flow to re-enter the through-flow element from the bypass channel.