PURPOSE: To allow the stable passage of a body by forming a groove for shutting out a magnetic line of force leaking from a main line track to a transverse shift track on the surface of the transverse shift track faced to a levitation electromagnet in the main line track.

CONSTITUTION: Transverse beams 2 are respectively provided at front and rear sides on the top of a body 1 in such a way as to be freely capable of turning and oscillating, and levitation electromagnets 3 and gap sensors are fixed at both ends on the top of both transverse beams 2. Furthermore, main line tracks 9 comprising a strong magnetic substance are laid in parallel at lower both sides of a hollow frame material 7. In addition, grooves 17 are formed along the main line tracks 9 on the lower surface of an inner transverse shift track 15 of a strong magnetic substance between right and left main line tracks 9, or the aforesaid lower surface faced to the levitation electromagnets 3. According to the aforesaid construction, when the electromagnets 3 pass the installation position of the transverse shift tracks 15 and 16 during the travel of the body 1 along the main line tracks 9, a drop in guiding force is prevented with the effect of the grooves 17, thereby preventing the occurrence of a body oscillation or the like.