Abstract: A substrate storing container provided with a container main body, a lid body, a lateral substrate support portion, a lid body side substrate support portion, and a back side substrate support portion includes a casting-off portion that casts off a substrate in a state being supported by the back side substrate support portion and the lid body side substrate support portion from at least one of the back side substrate support portion or the lid body side substrate support portion. When the lid body is opened from the container main body opening portion from a state in which the container main body opening portion is closed by the lid body.