To provide a cleaning tool in which even a container of a shape in which an opening is extremely narrow and swells greatly from a shoulder part, as a PET bottle and a flask container, can be cleaned while the cleaning tool firmly reaches the shoulder part and an inner surface and presses the same.

The cleaning tool is mainly characterized most as follows. The handle of the cleaning tool is assumed to be a grasping type of a syringe shape. When the handle is grasped, two or more arms provided with a washing part and installed at the end of a piston each travels away from each other in an opposite direction as the arms are extruded by the piston, thrust in the container while pushing together, firmly reach the container inner surface including the shoulder part with an angle because the washing part is movable, and clean while pressing.