To provide a belt for clothes which can set up the tightening length minutely which serves to measure a user's waist and to control health management by measuring physical exercise in a simple way.

A buckle 2 comprises a chief buckle 3 and an assistant buckle 4. The basic end of belt 1 is fixed with a chief buckle 3 and the tip of the belt 1 is fixed to be slidable with the assistant buckle 4. The belt 1 is provided with a scale 5. An engaging hole to the chief buckle 3 and an engaging hole together with a removable latch to the assistant buckle 4, are respectively arranged. A fixing means 15 to fix and cancel of fixation with the belt 1 is prepared with the assistant buckle. The chief buckle 3 is equipped with a measuring instrument 6.