Sensing method with Quantum Cascade Laser (QCL) as a light source is expected to offer a high sensitivity, a short measurement time, and a good portability compared to conventional methods. However, commercially available QCLs have high power-consumption of several W. Therefore, a large power supply is required to drive QCL, and most of the input power is released as heat, leading to the necessity for a large cooling system. For these reasons, portable gas sensors using QCL have not been realized. To address this issue, we had recently developed a low power-consumption DFB-QCL in the 7μm wavelength region. In this study, we developed a compact and low power consumption QCL module with Φ 15.4 mm To-CAN package. The QCL device, a thermoelectric cooler (TEC), a thermistor and a window were assembled in this package. The threshold power-consumption and the maximum output power were 0.97 W and 37 mW at 20°C, respectively under continuous wave driving. In addition, it maintained a single mode operation between 20°C and 80°C without a mode hopping. The performance of this QCL module as a light source for gas sensing was evaluated by measuring the mid-infrared absorption spectrum of the methane gas with a multi pass type gas cell. High sensitive methane gas detection was achieved, which was comparable to that of the conventional high heat load (HHL) packaged QCL module reported by other group. It is expected that a compact and low-cost MIR gas sensor with high-sensitivity can be realized with our QCL module.