To provide a sharing service system that, upon registering a person other than holding persons in a family in a service application, makes it possible to accurately and collectively register individual information on each person of the family with no cumbersome procedures.SOLUTION: A sharing service system of the present invention comprises: an individual identification information recording device in which individual identification information being identification information on a carrying holder and being authenticated by an individual information authentication institute, and constituent member identification information being identification information on a constituent member other than the holder of the constituent members including the holder itself of a family of the holder, and being authenticated by the individual information authentication institute are stored; and a service provider server that, when a use of a prescribed service is applied from the holder, acquires the individual identification information on the applying holder, and the constituent member identification information on the family of the applying holder from the individual identification information recording device, and registers the holder, and respective constituent members as an object person for which the service is provided.SELECTED DRAWING: Figure 1
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