An electric motor has an internal stator (21) and an external rotor (2). The external rotor (2) has a rotor housing (3) and a plurality of magnets (9) mounted therein and is adapted to rotate around a rotation axis (10); the magnets (9) are preferably bar magnets; the rotor housing (3) has an inner surface (7), a first end (5), and a second end (6) located opposite the first end (5) and the inner surface defines respective receiving surfaces (11) for reception of the magnets. each receiving surface features a channel depression (13) to receive a magnet (9). The magnets (9) are each fastened on a respective one of the receiving surfaces (11) with the aid of an adhesive mounting agent (36). A first bearing seat (14) for reception of a first bearing cage (15) is formed at the second end (6) of the rotor housing (3).