To provide a washing brush capable of efficiently and easily washing the inside and outside of a beer mug, simplifying constitution and being easily manufactured.

This washing brush 1 is constituted by connecting a pair of brush main bodies 3 to both ends of a U-shaped handle 2 so as to be parallelly extended. For the handle 2, a flat part 4a is formed at the intermediate part of a metal pipe material 4, it is curved and formed into a U shape and a soft cover 5 made of synthetic resin is put on it. For the brush main body 3, two metal wires are turned to core wires 6, a bristle material 7 is clamped and stranded and the bristle material 7 is fixed so as to be helically continued. The brush main bodies 3 are in the interval of bringing the tip parts of the bristle materials 7 of each other into contact. The base end part of the core wire 6 is fixed by caulking the pipe material 4. The tip part of the core wire 6 is curved in a spiral shape so that the bristle material 7 is excellently brought into contact with the inner surface of the mug. Then, one brush main body 3 is inserted to the inside of the mug and both inner and outer side faces of the mug are simultaneously washed.