PURPOSE: A rotary type bubble jet aerator for enhancing the stirring effect of the liquid is provided to improve oxygen transfer efficiency while widening the contact surface with the liquid. CONSTITUTION: A rotary type bubble jet aerator flows air in a diffuser. A central axis(11) is formed into a fixing center axis and a rotation center axis. A branch(12) is formed in a rotation angle. The flux of the air which is consecutively formed in the branch is multiplied. A jet nozzle body(15) produces the bubble jet in a nozzle neck form. A shaft rotation part is formed between the fixing center axis and the rotation center axis.
