PURPOSE: To enable running along curves in a high speed running state, and to prevent the dropping from a vertical or loop running way by alternately arranging permanent magnet continuously with its polarity being reversed, and alternately arranging different polarity contact pieces along the arranged direction of the magnet.

CONSTITUTION: A running way 1 is alternately arranged continuously with the polarity of permanent magnet 3 being reversed, at the central portion in the width direction of a base 2 comprising an insulating material such as plastic, along the length direction. The way 1 is provided with a base 5 formed of printed contact pieces 4, 4' continuously arranged so as to have reverse polarity each other on the top face of the magnet 3, which base is placed on the way 1, and the top face is covered by a cover 6. This cover 6 has two rails 7, 7, at the central portion of the upper width direction, and through hole 8 is arranged over the whole area between the rails 7, 7', and thereby the contact pieces 4, 4' on the top face of a printed board 5 is exposed. A hook member 9 on the side of this cover 6 is engaged with inner edge stepped part of a hole 10 bored on a lower plate 2' and fixed.