Load port and method for opening/closing storage container

A method for opening/closing a storage container that stores a substrate, the method comprising:

• a stage moving operation of moving a stage on which the storage container is mounted in a direction toward a base to bring an opening provided in the base at a position facing a lid of the storage container mounted on the stage and the lid closer to each other;
• a lid holding operation of causing a door closing the opening to hold the lid disposed to face the opening;
• an opening operation of moving the door together with the lid held by the door from a closing position in which the door closes the opening to an opening position in which the door opens the opening;
• a closing operation of moving the door together with the lid held by the door from the opening position to the closing position;
• and
• a movement restricting operation of causing a movement restricting part to restrict a movement of the stage in a direction away from the base by abutting against the stage when the door is pressed toward the opening and the lid held by the door is attached to a container main body of the storage container in the closing operation.