Burner (1) for gas cookers, of the type comprising at least one flame spreader (2) and at least a corresponding lid (3) adapted to define at least partially a transit chamber (20) for a gas-primary air fuel mixture, said at least one flame spreader (2) comprising at least a plurality of radial outlets (4) to feed a plurality of main flames with said fuel mixture, and at least one outflow port (5), placed over said plurality of radial outlets (4), to feed with said fuel mixture at least one pilot flame, said at least one outflow port (5) being shaped to direct said at least one pilot flame towards said at least one plurality of radial outlets (4). The burner further comprises at least one storage chamber (6) for the fuel mixture for said at least one pilot flame, placed nearby and in fluidic connection with said at least one outflow port (5), said storage chamber (6) being fed by one or more inlets (7) disposed in fluidic communication with said transit chamber (20) for the fuel mixture.