[Object] To realize a system that can more accurately analyze a movement of a body with a simpler configuration. [Solution] An information processing device includes: a first member that includes a substantially plate-shaped casing and a predetermined detection unit； a second member that includes a substantially plate-shaped casing and that holds a battery inside the second member； and a connection unit that includes an elastic body and connects a part of an outer circumferential end surface of the first member to a part of an outer circumferential end surface of the second member such that a surface direction of one surface of the first member substantially matches a surface direction of one surface of the second member. The information processing device is worn on a predetermined body part such that the one surface of the first member and the one surface of the second member are located on a side of the body part.
