An air-conditioning register is buried in a decorative panel having a decorative surface, and includes a cylinder-shaped retainer having a ventilation passage, a fin assembly disposed swingably and adjacent to the outlet opening in the retainer, a connecting member for connecting the fin assembly, and an operating member for driving the connecting member. The air-conditioning register operates interchangeably between a blowing direction adjusting mode, in which the fin assembly adjusts a blowing direction of air-conditioning air, and a shut-off mode, in which the fin assembly shuts off the outlet opening. The ventilation passage extends in a lengthwise direction which intersects with the decorative surface at an acute angle. The fin assembly includes main fin members, and a sub fin member. In the blowing direction adjusting mode, the main fin members swing, but the sub fin member is held substantially parallel to the lengthwise direction of the ventilation passage.