Abstract: Provided are a binding band assembly for a headset and a headset. The binding band assembly includes: a housing in which a rotatable gear is provided; a first binding band and a second binding band each provided with a rack meshed with the gear to drive the first binding band and the second binding band to move towards or away from each other when the gear rotates; a transmission member provided in the housing and fixedly connected to the gear; and a rotation control member provided on the housing and having a toggle portion, a rolling member being provided between the toggle portion and the transmission member, and the toggle portion being configured to drive, by pushing the rolling member to roll, the transmission member to rotate.