A buckle arranged to connect a band member to a connected member includes a base having an attaching portion for the connected member, a base portion, and opposing lever member supporting portions projecting from the base portion. A lever member is rotatably attached to the base, and includes a combined portion and an operating portion extending from the combined portion. The operating portion includes a slit through which the band member is allowed to pass. The lever member further includes a clamping portion protruding from the combined portion in a direction different from the operating portion. The clamping portion is configured to clamp the band member, which passes between the base portion and the combined portion, to the base portion by a rotation of the lever member towards the base.