A cushion includes an accommodating cavity for accommodating a nose or oronasal part, which is defined by a contact portion, a connecting portion and an intermediate portion. The contact portion is configured to be in sealing contact with a patient's face. The connecting portion is configured to connect with a frame of the respiratory mask. The intermediate portion is connected between the contact portion and the connecting portion. The intermediate portion is formed with a recess portion recessed toward the accommodating cavity. The recess portion is formed into an arc or ring shape extending in a circumferential direction of the cushion, which includes a first connecting wall and a second connecting wall. A projection area S2 of the first connecting wall on a vertical plane is smaller than a projection area S1 of the second connecting wall.