An ATM(Automated Teller Machine) having the gas sensor can inform the fire station or the police station of the detection result of poisonous gas by using the wire/wireless communications network. The ATM comprises the gas detection means(80), the warning measure(85), and the communications means(70) and controller(90). The gas detection means is mounted on the fixed position of ATM. The gas detection means detects the poisonous gas. The warning measure informs the detection result of the gas detection means to outside. The warning measure is made of the speaker, and the display device and lamp. The controller controls the gas detection means, and the warning measure and communications means.