To provide a laser type gas analyzer that does not require a reference gas cell used for correction to prevent wavelength loss and reduces the cost through simplification of the device.SOLUTION: A laser type gas analyzer comprises a signal processing circuit for measuring the concentration of gas to be measured from a gas absorption waveform present in a first wavelength sweep range of a laser beam. The signal processing circuit includes a correction unit that identifies a position of a peak wavelength of the gas absorption waveform of the gas to be measured in a second wavelength sweep range based on a relative relationship of positions of peak wavelengths of a plurality of gas absorption waveforms detected by sweeping wavelengths of the laser beam in the second wavelength sweep range that is extended from the first wavelength sweep range, and corrects the first wavelength sweep range of the laser beam based on the identified position.SELECTED DRAWING: Figure 4