To provide an auxiliary brush holder for a vacuum cleaner capable of storing a large number of auxiliary brushes.

An auxiliary brush holder 100 is provided with a frame 110 in which an opening part 114 to be connected to an extension tube is formed, an extension bar 112 which is extended downward from the bottom surface of the frame 110 and is to be inserted into a receptacle formed in a vacuum cleaner main body (530), and two arc-shaped ribs 132 and 142 integrally formed with the bottom part of the outer peripheral part of the frame 110 and extended upward up to the height equal to the upper surface of the frame 110. The arc- shaped ribs 132 and 142 are arranged at a predetermined distance from each other, and arc-shaped grooves 134 and 144 for placing auxiliary brushes are formed between each of the arc-shaped ribs 132 and 142 and the frame 110. The auxiliary brush holder 100 can store a large number of auxiliary brushes in a simple constitution. Therefore, it has an advantage that a user can improve the efficiency of cleaning by easily using various auxiliary brushes during cleaning.