A noise reducing structure includes an internal structural body that includes a noise source; an exterior body that includes an inner side surface facing the internal structural body and that covers an outer side of the internal structural body; a space portion that is surrounded by an erected wall, the internal structural body, and the inner side surface, the erected wall being erected so as to, from one of the internal structural body and the inner side surface towards the other of the internal structural body and the inner side surface, be connected to the other of the internal structural body and the inner side surface; and a sound absorbing opening portion that is connected to the space portion and that is formed at a portion near the noise source.