244 moves downward by the push button 310 and then may return to its initial position the elastic member 320 may be configured in a type of a pocket spring and a number of the elastic member 320 may be disposed to support at least two spots of the second housing 244 on the other hand although not shown in another embodiment of the disclosure the cone 270 shown in fig7 is disposed at the top of the collecting unit 220 and the first vent 241 and the second vent 243 may be disposed at the bottom side of the cone 270 fig1 shows a detailed configuration for the visualization device for dust collection of the vacuum cleaner according to another exemplary embodiment of the disclosure and fig1 is an exploded perspective view of fig1 as shown in these drawings in another embodiment of the disclosure the dust collecting unit 240 to be fastened to the collecting unit 220 is formed of a housing a number of a suction hole 290 are formed in the top of the dust collecting unit 240 so that the outer air may be introduced into the inside of the dust collecting unit 240 the top of the dust collecting unit 240 has a diameter narrower than that of the bottom thereof the top of the dust collecting unit 240 is selectively.