This invention provides a two pole one element type earth leakage breaker easy to assemble, without changing such a component disposition structure in which an voltage pole and a neutral pole is housed in one housing, a leakage detecting part is housed in the other housing respectively. This earth leakage breaker is structured so that a flexible cable connecting the movable contact of a neutral pole to the load conductor of the neutral pole is passed through a zero-phase-sequence current transformer, and a conductive pipe combined with the flexible cable on the side closer to the connection part where the flexible cable is connected to the movable contact is disposed in the upper part of an arc-extinguishing chamber.