A diagnosis assistance device for a plurality of optical characteristic measurement devices for assisting a diagnosis of an optical characteristic measurement device from the plurality of optical characteristic measurement devices operated on the basis of a content of setting stored in a setting storage unit of the optical characteristic measurement device at a time of use and at a time of diagnosis of the optical characteristic measurement device, comprising: a communication unit for communicating with the optical characteristic measurement device; a first storage unit configured to store in advance first setting information indicating the content of setting at the time of diagnosis, wherein, in the first storage unit, the first setting information provided for each of the plurality of optical characteristic measurement devices and IDs of each of the plurality of optical characteristic measurement devices are stored in advance in association with each other; a second storage unit; a processing unit configured to perform processing of acquiring, from the setting storage unit, second setting information which is stored in advance in the setting storage unit and indicates the content of setting at the time of use, and storing the acquired second setting information in the second storage unit; a first command unit configured to issue a command to store the first setting information, which is stored in the first storage unit, in the setting storage unit after the second setting information is stored in the second storage unit; a diagnosis unit configured to acquire a measurement result indicating a value measured by the optical characteristic measurement device operated on the basis of the content of setting indicated by the first setting information stored in the setting storage unit, and to generate information necessary for the diagnosis of the optical characteristic measurement device using the acquired measurement result; a permission unit configured to determine whether the ID associated with the first setting information selected for diagnosis from the plurality of pieces of first setting information matches the ID of the optical characteristic measurement device to be diagnosed before the optical characteristic measurement device to be diagnosed among the plurality of optical characteristic measurement devices is operated on the basis of the content of setting indicated by the first setting information stored in the setting storage unit, and to permit, when the matching is determined, the diagnosis unit to diagnose the optical characteristic measurement device to be diagnosed; and a second command unit configured to issue a command to store the second setting information, which is stored in the second storage unit, in the setting storage unit after the diagnosis unit acquires the measurement result. a communication unit for communicating with the optical characteristic measurement device; a first storage unit configured to store in advance first setting information indicating the content of setting at the time of diagnosis, wherein, in the first storage unit, the first setting information provided for each of the plurality of optical characteristic measurement devices and IDs of each of the plurality of optical characteristic measurement devices are stored in advance in association with each other; a second storage unit; a processing unit configured to perform processing of acquiring, from the setting storage unit, second setting information which is stored in advance in the setting storage unit and indicates the content of setting at the time of use, and storing the acquired second setting information in the second storage unit; a first command unit configured to issue a command to store the first setting information, which is stored in the first storage unit, in the setting storage unit after the second setting information is stored in the second storage unit; a diagnosis unit configured to acquire a measurement result indicating a value measured by the optical characteristic measurement device operated on the basis of the content of setting indicated by the first setting information stored in the setting storage unit, and to generate information necessary for the diagnosis of the optical characteristic measurement device using the acquired measurement result; a permission unit configured to determine whether the ID associated with the first setting information selected for diagnosis from the plurality of pieces of first setting information matches the ID of the optical characteristic measurement device to be diagnosed before the optical characteristic measurement device to be diagnosed among the plurality of optical characteristic measurement devices is operated on the basis of the content of setting indicated by the first setting information stored in the setting storage unit, and to permit, when the matching is determined, the diagnosis unit to diagnose the optical characteristic measurement device to be diagnosed; and a second command unit configured to issue a command to store the second setting information, which is stored in the second storage unit, in the setting storage unit after the diagnosis unit acquires the measurement result.