The present invention relates to a gas lighter with a roller-rotation restraining part, extending toward a roller from one side of a top surface of a cap for surrounding a nozzle of the gas lighter so that the roller-rotation restraining part is caught by and brought in contact with the roller. Thus, a certain rotation-restraining force is added to the rotation of the roller by means of the roller-rotation restraining part which is caught by and brought in contact with the roller during the rotation of the roller for ignition to increase a finger grasp force required for the ignition of the gas lighter through the rotation of the roller, thereby being capable of preventing an accident, should the lighter get into the hands of a child.