A fishing reel includes a reel body and a sensor unit. The reel body has a handle configured to be rotated about a handle axis. The sensor unit is attached to the reel body. The sensor unit includes a unit body disposed coaxially with the handle axis, a behavior sensor disposed within the unit body and configured to detect behavior when the reel body is used, and a communicator disposed within the unit body and configured to transmit behavior data to the outside based on the behavior detected by the behavior sensor.
