Abstract: An outdoor gas heater used in the field is provided. The outdoor gas heater includes a primary combustion net having a dual net structure. A wind-proof cover is provided to protect a thermocouple. Fuel gas is concentrated into a fuel gas discharge hole formed in the wind-proof cover so that an initial ignition performance is improved. A support is provided to support the outdoor gas heater from the top surface of a gas container. A fuel gas inlet tube is vertically installed between a head unit and a safety valve while being spaced apart from an adjustment handle, and a fire extinguishing safety device is provided behind the fuel gas inlet tube, so that the fire extinguishing safety device is hidden by the fuel gas inlet tube, thereby minimizing a volume of the gas heater without degrading aesthetic appearance of the gas heater.