COMBUSTIBLE GAS DETECTION DEVICE

A combustible gas detection device includes an energization control circuit which performs a control operation of switching the state of energization of a heat generation resistor every time a predetermined period of time elapses such that the heat generation resistor alternately has resistances corresponding to two set temperatures set in advance, a temperature measurement resistor which is disposed on the same substrate on which the heat generation resistor is disposed and the resistance of which changes with the environmental temperature, a gas concentration computation section which calculates the concentration of a combustible gas by using a voltage generated across the heat generation resistor which is detected when electricity is supplied to the heat generation resistor and the environmental temperature based on a voltage change which occurs as a result of a change in the resistance of the temperature measurement resistor. The period of time has a length determined in advance such that a change in the environmental temperature which occurs when the energization control circuit switches the state of energization of the heat generation resistor falls within a range of 0.5°C.