The load of setting and managing the access rule for access control is large. Provided is an information sharing system comprising an information gathering means, a transportable storage device for storing at least first information and second information, a certified acquisition request generation means, and a certified acquisition request processing means, sheering the information gathering means gathers the first information and the second information from the transportable storage device, the certified acquisition request generation means transmits a certified acquisition request including certification information comprising at least part of the second information, and the certified acquisition request processing means determines, on the basis of the result of checking whether or not the certification information included in the received certified acquisition request matches any part of the first information, whether or not to transmit the first information to a device equipped with the certified acquisition request generation means that is a transmission source of the certified acquisition request.