PURPOSE: To execute reliable and compact fixing by a method wherein when a connecting rod drive device for a rotating door is mounted in a guide groove formed in a sash, the contact surface of the casing bottom of the device is placed on a guide groove bottom and threadedly mounted by a fixing screw.

CONSTITUTION: A sinus part adapting to a segment-form protrusion 11 is formed in a portion ranging from the space side in cross section of a sash 1 to a cross section edge 31. A drive device case 7 is inserted in a groove 3 opened to the rabbet joint surface of the sash 1. A screw 37 is inserted in the containing hole of contact legs 25 at the two ends of a case 7 bottom and screwed in a threaded bore 39 of a groove bottom 31. This constitution executes fixing in a manner to reliably support a further load and reduce the size of the hole of a guide groove bottom to contain a case protrusion part.