Abstract: An air purifier designed to allow dust collected on a surface of a dust filter therein to be conveniently and rapidly removed from the dust filter without separating the dust filter from the air purifier unit. The air purifier includes a vibrating member equipped adjacent to the dust filter, and a vibration motor assembly equipped to the vibrating member to remove dust attached to the dust filter through vibratory motion. The dust filter is equipped at an angle within the housing for the air purifier such that an upper end of the dust filter is closer to a front side of the housing than a lower end of the dust filter. The air purifier may further include a tray equipped below the dust filter to collect the dust that drops from the dust filter when the dust filter is vibrated by vibration of the vibrating member. The tray has a rear plate extending towards the lower end of the dust filter to prevent the dust collected in the tray from being scattered and then reattached to the dust filter.