Provided is a group management system for an elevator which is capable of making a change as necessary even after an assignment car is determined and providing a service comfortable for a user. The group management system is provided with a call registration device for registering a loading zone destination call before a user is loaded on the elevator, a car position detection unit for detecting a car position of the elevator, and a call registration storage unit for storing the registered loading zone destination call for each elevator. In the case where a loading zone destination call, the content of which is the same as the already registered loading zone destination call stored in the call registration storage unit is newly registered by the call registration device, if a non-assignment car has already reached a floor where the call registration device is installed, the loading zone destination call of the new registration is assigned to the non-assignment car.