A panel loading method for loading an inner panel to an outer panel that has a bent portion provided by bending a periphery thereof, the outer panel and the inner panel being overlapped to integrate the outer panel and the inner panel at the periphery thereof. The method includes: providing at least one of the outer panel and the inner panel by an elastic body; disposing the outer panel onto a panel receiver so that the bent portion is directed upward; placing a guide plate on or above the bent portion; loading the inner panel into the outer panel from above the guide plate; and inserting the inner panel into an inside of the bent portion.