To provide an air filtration cleaner formed of a specific filter or an element and its auxiliary means and increasing combustion efficiency by activating intake air supplied into an internal combustion engine.

A carbon fiber material or carbon fiber pieces, for example, as a so-called the intake air activator 25, is stretched/laid down horizontally on the upper surface of a roughly rectangular frame body 23. A roughly chevron-shaped filter (element) 24a formed in a bag shape, for example, is disposed on the lower surface of the roughly rectangular frame body 23 in the state of being inserted into the roughly rectangular frame body 23 with its chevron-shaped top parts 24b projected in series downward. Various types of intake air activators 25, for example, tourmaline granular agent and glass fiber granular agent are filled in the roughly chevron-shaped filter (element) 24a. When an intake air flows through the air filtration filter A, the roughly chevron-shaped filter (element) 24a generates negative ions, static electricity, or infrared ray in the intake air to active the intake air.