Bicycle rear sprocket assembly and bicycle rear sprocket

A bicycle rear sprocket assembly comprising:

• a first sprocket having a first bicycle inbound facing surface and a first bicycle outbound facing surface opposite to the first bicycle inbound facing surface in an axial direction parallel to a rotational center axis of the bicycle rear sprocket assembly, the first sprocket including:
• a first sprocket body,
• a plurality of first sprocket teeth extending radially outwardly from a first radially outer periphery of the first sprocket body with respect to the rotational center axis,
• a bearing unit mounting section at least partly provided to a first radially inner periphery of the first sprocket body, and
• a first torque-transmitting structure configured to transmit pedaling torque to a second sprocket separately disposed adjacent to the first sprocket without another sprocket between the first sprocket and the second sprocket, the first torque-transmitting structure being provided to the first bicycle inbound facing surface and being a separate member from the second sprocket.