To provide a vacuum cleaner the suction auxiliary device of which can be engaged with a cleaner body simply, in the cleaner where a dust collecting box is attachably and detachably mounted on the rear part of it.

This cleaner includes the cleaner body 10 accommodating a suction means, a dust collecting box 20 connected detachably at the rear part of the cleaner body 10 and the extension pipe of the suction auxiliary device for guiding air sucked by the suction means to the inside of the cleaner. An engaging projection part 32 is formed at the suction auxiliary device, and an engaging part 24 for hanging the part 32 is formed at the box 20 so as to hang the suction auxiliary device to the box 20.