Abstract: A pumping apparatus of the bellows type, which is adapted for artificial respiration of a distressed person having temporarily no ability to breathe by himself, comprises a bag (2), arranged with two mutually movable walls (3,4) delimiting the inner volume thereof, to participate in delimiting the inner volume of the bellows (5). The ends of the folded bellows wall are fastened to one of the two walls each and the pump is arranged to force the air contained in the bellows space aside and to suck air thereinto by movement of the two walls (3,4) towards each other and away from each other, respectively.