The construction and function of a self-warmed, portable incubator for sealed worker honey bee (Apis mellifera) brood is described here. This incubator can be used by both static and migratory beekeepers. The prerequisites of a rational use of a portable incubator in the early to middle spring are cited. A brief overview of the possible uses of the incubator is given. Finally, comparisons with other known techniques related to swarm prevention, to production of new colonies and/or to treatment of varroosis are also made.