Folding chair with armrests, type S, articulated by transversal axes to the armrests. It has a seat; a back; a horizontal base that is set on the ground; two front legs that join the front part of said seat with the horizontal base that is set to the ground; an attachment mechanism in the application position; two joining bars that articulate the armrests with the middle part of the seat and with the horizontal base that is set to the ground.