A clasp for connecting a pair of bands has a support member connected to one of the bands and a movable member connected to the other of the bands. A plurality of engaging parts that engage the movable member are disposed to the support member along the length of the band, and the movable member can be moved from one engaging part to another engaging part only when the movable member is inclined to the support member. The length can therefore be adjusted with a simple, easily understood operation using a simple and compact arrangement.