Device for confining worker bumblebees (Bombus spp.), Such as a nest box, comprising a series of barriers (2, 3, 4, 5) that form a series of chambers suitable for confining worker bumblebees, in which said barriers ( 2, 3, 4, 5) comprise a laminate comprising a cellulose board, preferably solid cardboard, covered with a layer of 10-500 μm thick of a material comprising a series of polymers, said polymeric material presenting a resistance to the tensile of at least 25 MPa and an indentation microhardness of at least 80 MPa, in which a layer of polymeric material is preferably a layer of the outer surface of the laminate, and in which one side of the laminate where it is located preferably the polymeric material is oriented towards the space of the series of chambers where worker bumblebees may be present.
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