A ceiling type air conditioner includes a housing having an inlet and an outlet, a heat exchanger provided inside the housing to exchange heat with air suctioned through the inlet, a blower fan configured to cause the air having heat exchanged with the heat exchanger to flow such that the air having heat exchanged is discharged through the outlet, and a blade unit configured to guide the air discharged to the outlet. The blade unit includes a main blade, a sub-blade, and a guide link provided to guide a movement of the sub-blade.