A rotation support (10), particularly for rotors of electric motors of pumps, of the type that comprises a stator, which is composed of a pack (39) of metallic laminations that form the pole shoes and is fixed to the flanged head (14), of a hollow body (12) in which a permanent-magnet rotor (13) is arranged, one end (16) of the shaft (17) of the rotor (13) being coupled rotatably to the bottom (11) of the hollow body (12), which is provided with an axial hermetic plug (15) that can be opened by the user. The support (10) comprises, in succession from the bottom (11) toward the head (14) of the hollow body (12), and stacked in a corresponding substantially cylindrical seat (18) formed within the bottom (11) and provided with an end retention element (25): an internally threaded element (19), for the engagement of the axial plug (15); a self-aligning and self-centering bush (21), within which one end (16) of the shaft (17) is coupled rotatably, the bush (21) being arranged with play and with a rotation-preventing mating in a conical portion (18b) of the seat (18) that tapers from the head (14) toward the bottom (11) of the hollow body (12); an O-ring (23), which is interposed so as to interfere between the bush (21) and the seat (18); and an element (24) for retaining axial sliding for the threaded element, bush and O-ring of the support (10).