A control device is provided for a human-powered vehicle that includes an operation detector that detects a first parameter correlated to a predetermined operation performed by a rider on the human-powered vehicle, a terrain detector that detects a second parameter correlated to terrain of a road on which the human-powered vehicle is traveling, and a travel detector that detects at least one of a traveling state and a traveling environment of the human-powered vehicle. The control device comprises an electronic controller and storage. The storage is configured to continuously store predetermined information that includes the first parameter and the second parameter. In a state where the storage is continuously storing the predetermined information, the storage controller is configured to stop the storage from continuously storing the predetermined information in accordance with an output from the travel detector.