[en] The invention falls into the field of low energy neutron physics and can be used for ultracold neutron storage. The invention is aimed at increasing the efficiency of neutron injection and simplifying the standard design of the ultracold neutron magnetic trap containing a vacuum chamber inside an electromagnet, the poles of which are in the vicinity of the external wall of the chamber. The aim is reached by placing the poles and coils of the electromagnet coaxially along the bottom and side walls of the vacuum chamber, the chamber having a hole for neutron injection in the center of its bottom and coaxial with the central coil