Induction synchronous motor

An induction synchronous motor according to the present invention includes a stator (30), a rotor (1), and a bearing (11). A rotor core (2) of the rotor (1) includes a recess (17) in an upper surface located in the direction of a shaft center (10). The recess (17) includes an inner surface facing the surface of a rotary shaft (16) for a depth (D) from the upper surface. When the bearing (11) is attached to the rotary shaft (16), the recess (17) faces a cylindrical part (11a) via a gap (18). A permanent magnet (4) buried in the rotor core (2) is configured such that the length (L1) of the permanent magnet (4) is shorter than the length (L2) of the rotor core (2) in the direction of the shaft center (10). The permanent magnet (4) is positioned with the upper end surface thereof located deeper than D / 2 from the upper surface.