PURPOSE: To provide a safety lock device of an elevating body along a guide rail capable of smoothly working without causing a trouble to work on the elevating body and securing safety in case of emergency.

CONSTITUTION: A falling detection rod 31 to detect lowering of an elevating body at the time when a wire rope is cut off by way of providing it on the elevating body is doubly used as a mount 22 of a vertically moving winder 19, this falling detection rod 31 and a wedge member 40 of a lock mechanism 37 to fix a guide rail 13 by damping it under pressure are connected to each other through a link mechanism 34, and a roller 41 of this wedge member 40 is devised to elevate along an inclined surface 39 of a fixed block 38. Thereafter, the lock mechanism 37 is positioned on the guide rail 13 sequentially set from below and certainly fixed and locked on the guide rail 13 by a wedge effect by way of transmitting movement of the falling detection rod 31 to the wedge member 40 in case of emergency. Consequently, it is possible to simplify structure, to work smoothly and to secure safety in case of emergency.