A bicycle rear sprocket comprises a sprocket support member, a first attachment portion, and a second attachment portion. The sprocket support member comprises a first support member and a second support member. The first support member includes a first radially outer portion and a first radially inner portion. The second support member includes a second radially outer portion and a second radially inner portion. The first support member faces the second support member in the axial direction to define an axial gap provided between the first support member and the second support member in the axial direction. The first radially outer portion of the first support member is configured to be attached to the second radially outer portion of the second support member via a bicycle sprocket positioned between the first attachment portion and the second attachment portion in the axial direction.