A blade attaching method is provided for a power generating apparatus which may include a blade, a hub having a blade attaching part, a bearing, a generator, and a pitch drive mechanism. The method may include, but is not limited to: a step of attaching a suspension device to the blade; a step of lifting the blade; a step of holding the blade so that the blade attaching part of the hub faces the blade root part of the; a step of rotating the blade attaching part by the pitch drive mechanism to a set angular position while holding the hub; and a step of fixing the blade to the hub after rotating the blade attaching part to the set angular position.