Provided is a cleaning device that does not cause degradation of cleaning performance even if there is an obstacle on a surface to be cleaned. A cleaning device includes a housing, blades used for cleaning, a cleaning liquid supply section for supplying cleaning liquid to a surface of a solar cell module, and a wheel for travelling on a solar photovoltaic power generation device. Moreover, the blades are arranged in such a manner that regions which pass through a fixation member are shifted and overlap each other in a front-rear direction with respect to an advancing direction.