A rotor assembly (5, 5B, 5C) includes: a shaft (51) disposed along a central axis (Ax) extending vertically; a tubular magnet (52, 52B, 52C) disposed on a radially outer surface of the shaft (51); a lower spacer (55, 55B) disposed axially below the magnet (52, 52B, 52C) and fixed to the radially outer surface of the shaft (51); and a tubular magnet holder (53) fixed to a radially outer surface of the magnet (52, 52B, 52C) via an adhesive (Ad). At least a part of an axially lower surface (531) of the magnet holder (53) is in contact with an axially upper surface (551) of the lower spacer (55, 55B).