Bottom part arrangement (8) (1) in the beehive structure meant for bees in which beehive structure the body piece (8) of the bottom part is a frame with a gap at the bottom inside which a separate bottom plate (1) can be adjusted while resting on the mentioned frame which bottom plate can be pushed into the body piece (8) in the direction of the planar part (4) of the bottom plate (1) to the first, horizontal position and to the second, horizontal position in which case it is turned upside down in relation to the first position. There is a retracted form (5) at the edge part of the planar part (4) of the bottom plate (1) for forming an air channel between the edge of the plate (1) and the frame part of the body piece (8).
