A nesting chair comprising: a base including a straight transverse member having a medial portion located between a pair of spaced outer ends; a backrest and seat interconnected with the base; a seat rotation mechanism disposed between the base and the seat configured to allow the seat to rotate from a seating position to an upwardly rotated nesting position, wherein the seat rotation mechanism includes a first bearing area defined by an underside of the seat, a second bearing area defined by a separate bearing member, wherein the first and second bearing areas (78,88) are located on opposite sides of and engaged with the medial portion of the transverse member, and a retainer arrangement interconnected with the bearing member (78,88) and seat to secure the bearing member (78,88) to the seat with the transverse member therebetween, wherein the seat is rotatable about the transverse member from the initial seating position to the upwardly rotated nesting position to enable the nesting chair to be nested with a plurality of like chairs, and wherein the transverse member is provided with a stop engageable with the seat for maintaining the seat in the seating position, characterised in that the first and second bearing areas (78, 88) have mating bearing collar segments (76, 86) which are formed internally with continuous mating slots defined by walls that fully surround the outer surface of the transverse member; and further characterised by a roll pin for maintaining a centering position of the seat relative to the transverse member extends through the medial portion of the transverse member and has outer end portions that project into the mating slots such that the transverse member and the roll pin are completely enclosed between the first and second bearing areas (78, 88), and protected from outside exposure through the first and second bearing areas (78, 88). a base including a straight transverse member having a medial portion located between a pair of spaced outer ends; a backrest and seat interconnected with the base; a seat rotation mechanism disposed between the base and the seat configured to allow the seat to rotate from a seating position to an upwardly rotated nesting position, wherein the seat rotation mechanism includes a first bearing area defined by an underside of the seat, a second bearing area defined by a separate bearing member, wherein the first and second bearing areas (78,88) are located on opposite sides of and engaged with the medial portion of the transverse member, and a retainer arrangement interconnected with the bearing member (78,88) and seat to secure the bearing member (78,88) to the seat with the transverse member therebetween, wherein the seat is rotatable about the transverse member from the initial seating position to the upwardly rotated nesting position to enable the nesting chair to be nested with a plurality of like chairs, and wherein the transverse member is provided with a stop engageable with the seat for maintaining the seat in the seating position, characterised in that the first and second bearing areas (78, 88) have mating bearing collar segments (76, 86) which are formed internally with continuous mating slots defined by walls that fully surround the outer surface of the transverse member; and further characterised by a roll pin for maintaining a centering position of the seat relative to the transverse member extends through the medial portion of the transverse member and has outer end portions that project into the mating slots such that the transverse member and the roll pin are completely enclosed between the first and second bearing areas (78, 88), and protected from outside exposure through the first and second bearing areas (78, 88).