A piece of seating furniture having a base and a seating unit, and a rotary mounting arrangement including a base-side bearing device and a seating-unit-side bearing device via which the seating unit is rotatable with respect to the base, and the rotary mounting arrangement has a switchable blocking device for blocking the rotatability of the bearing devices. The blocking device has two profiles including an inner profile attached to one of the two bearing devices in a rotationally fixed manner, and an outer profile attached to the other of the two bearing devices in a rotationally fixed manner. The outer profile and the inner profile are displaceable with respect to one another such that they are axially movable between an engaging relative position rotationally coupled in a form-fitting manner and a releasing relative position.
