A cushion for a breathing mask and a breathing mask. The cushion includes a connection portion for connecting to a frame or an elbow assembly of the breathing mask; a face contact portion for getting in contact with the face of a patient, wherein the face contact portion is formed by a thin membrane; and a support portion which is connected between the connection portion and the face contact portion, wherein the face contact portion has an external extension portion which extends from the support portion to the exterior of the cushion and an internal extension portion which extends from the outer circumference side of the external extension portion to the interior of the cushion in at least partial area.