A vehicular engine control device provided with a control unit for performing control that automatically stops an engine installed in a vehicle when a preset stop condition is fulfilled, and a traveling information acquiring unit for acquiring travel information including vehicle speed information relating to the speed of the vehicle and steering information relating to a steering wheel. For the stop condition the vehicle speed information and steering information acquired by the traveling information acquiring unit are set including respective thresholds. The control unit switches the stop condition in accordance with changes in the vehicle speed information, the stop condition being sectioned into a plurality of regions using steering thresholds for the steering information relating to the steering handle. Automatic stop control of the engine conforming to the intentions of the driver can be implemented by the vehicular engine control device.