PROBLEM TO BE SOLVED: To provide a gas sensor group which can separately and sufficiently detect an inflammable gas in wet air containing a volatile impurity.SOLUTION: The gas sensor group is used for detecting an inflammable gas, and includes at least one type of a semiconductor gas sensor of a bulk response type and several different types of semiconductor gas sensors of a grain boundary response type. The method for analyzing an inflammable gas includes the step of detecting an inflammable gas, using the gas sensor group.SELECTED DRAWING: None