Abstract: In a tambour door opening/closing apparatus, a tambour door is moved along a longitudinal axis between open and closed positions under restraint of a frame guiding opposed sides of the door. A constant spring is mounted to the tambour door and has a section thereof extending generally along the longitudinal axis to assist in moving the tambour door between the opened and closed positions. A fixed rod is mounted between the frames guiding both sides of the door and a spool is rotatably mounted on the rod with the spring being coiled around the spool and the exposed end of the constant spring is attached to the tambour door. A track assembly is mounted on each side of the frame for guiding the movement of the tambour door and includes a substantially straight portion extending substantially the length of the opening and a loop portion with a coiled track for forming coils of the tambour door.