ATTACHMENT POSITION DETECTOR OF CONSTRUCTION MACHINE

PROBLEM TO BE SOLVED: To provide an attachment capable of accurately controlling a position by arranging a winding type dimension sensor between members for moving a work tool such as a bucket to a prescribed position, and detecting mutual turning angles by the length of a winding. SOLUTION: A winding type dimension sensor for detecting a turning angle between members is arranged on an attachment of a construction machine such as a hydraulic excavator. In the winding type sensor, a winding sensor is arranged in one member, and the end part of a winding is fixed to the other member to be formed as a sensor for detecting an angle by the length of the winding. A winding dimension sensor 31 is arranged at a point separate by a distance La from a connecting pin 30 of an offset arm 11 and an arm 12, and the end of winding 32 is fixed to a pin 33. The pin 33 is arranged at a point of the arm 12 separate by a distance Lb from the connecting pin 30, and is desirably set to La=Lb. Thus, a turning angle can be more accurately determined, a position of the attachment can be accurately controlled, and can also be easily calibrated.