To achieve high-level positioning accuracy in relation to a panel member, and to avoid an adverse effect, even when the panel member has flexibility and elasticity.

A positioning system of a panel member comprises: at least one or more positioning devices Me including a slider (first slider) 4 slidably supported on a guide rail 3 arranged on a base 2, a driving motor 5 displacing integrally with the first slider 4, a ball screw mechanism 7 including a nut part 7n displacing integrally with a contact 6 and a screw part 7s connected to a rotary shaft 5s of the driving motor 5, an elastic support part 8 for elastically supporting the driving motor 5 in a displacement direction, a contact position detection part 9 for detecting a displacement position of the contact 6, and a contact load detection part 10 for detecting the magnitude of load to be applied to the contact 6; and a control part 11 for controlling the driving motor 5 according to at least detection results of the contact position detection part 9 and the contact load detection part 10.