In a band in which a plurality of members are connected to one another through joints serving as connection axes parallel to one another, an inter-panel angle indicating an angle between the members adjacent to each other through the joint is adjusted. Each joint is provided with an angular sensor for detecting the inter-panel angle. Based on the detected inter-panel angle, the peripheral shape indicating a shape of at least a part of a periphery of the object to be measured, on which the band is mounted, is measured. The present technology, for example, is useful for an abdominal girth measurement apparatus.