A thermal flow meter for measuring a flow rate of a fluid, comprising: a heat-generating resistor that generates heat when a current flows therethrough; a control circuit to control the current flow, wherein the control circuit includes: a first series circuit including - a resistance, - a first resistor, and - a second resistor, connected to each other in series; wherein a terminal of the first series circuit is connected to a ground potential; a second series circuit including - a third resistor, and - a fourth resistor, connected to each other in series; and - a voltage generation circuit that takes out voltages at both terminals (6, 7) of the resistance and outputs a voltage adjusted within a range between the voltages at both terminals (6, 7); wherein a terminal at a side of the third resistor of the second series circuit is connected to the output voltage of the voltage generation circuit, and the other terminal of the second series circuit is connected to the ground potential; characterized in that the resistance is a fixed resistance and a terminal at a side of the fixed resistance of the first series circuit is connected to a reference potential (Vref); wherein a resistance temperature coefficient of the second resistor and/or that of the third resistor is/are higher than that of the fixed resistance; and a resistance temperature coefficient of the first resistor is higher than that of the fixed resistance; and the voltage of the terminal at a side of the third resistor of the second series circuit is approximately the same as the output voltage of the voltage generation circuit which is adjusted within a range between the voltages at both terminals (6, 7). a heat-generating resistor that generates heat when a current flows therethrough; a control circuit to control the current flow, wherein the control circuit includes: a first series circuit including - a resistance, - a first resistor, and - a second resistor, connected to each other in series; wherein a terminal of the first series circuit is connected to a ground potential; a second series circuit including - a third resistor, and - a fourth resistor, connected to each other in series; and - a voltage generation circuit that takes out voltages at both terminals (6, 7) of the resistance and outputs a voltage adjusted within a range between the voltages at both terminals (6, 7); wherein a terminal at a side of the third resistor of the second series circuit is connected to the output voltage of the voltage generation circuit, and the other terminal of the second series circuit is connected to the ground potential; a first series circuit including - a resistance, - a first resistor, and - a second resistor, connected to each other in series; wherein a terminal of the first series circuit is connected to a ground potential; - a resistance, - a first resistor, and - a second resistor, connected to each other in series; a second series circuit including - a third resistor, and - a fourth resistor, connected to each other in series; and - a voltage generation circuit that takes out voltages at both terminals (6, 7) of the resistance and outputs a voltage adjusted within a range between the voltages at both terminals (6, 7); wherein a terminal at a side of the third resistor of the second series circuit is connected to the output voltage of the voltage generation circuit, and - a third resistor, and - a fourth resistor, connected to each other in series; and - a voltage generation circuit that takes out voltages at both terminals (6, 7) of the resistance and outputs a voltage adjusted within a range between the voltages at both terminals (6, 7); the other terminal of the second series circuit is connected to the ground potential; characterized in that the resistance is a fixed resistance and a terminal at a side of the fixed resistance of the first series circuit is connected to a reference potential (Vref); wherein a resistance temperature coefficient of the second resistor and/or that of the third resistor is/are higher than that of the fixed resistance; and a resistance temperature coefficient of the first resistor is higher than that of the fixed resistance; and the voltage of the terminal at a side of the third resistor of the second series circuit is approximately the same as the output voltage of the voltage generation circuit which is adjusted within a range between the voltages at both terminals (6, 7).