Electrically power assisted bicycle

An electrically power assisted bicycle comprising:

• a driving system including an electric motor that generates an assist force to assist human power of a rider and a first controller configured or programmed to control the electric motor;
• and
• an operation panel including a plurality of buttons and a second controller;
• wherein
• the plurality of buttons include a power button that turns on or off a power of the driving system, and an assist force setting button that sets an assist force of the electric motor;
• the second controller is configured or programmed to detect pressing of each of the plurality of buttons to execute a predefined process;
• and
• when the second controller detects a specific operation that is different from a normal operation, in which the button is pressed for less than a predetermined time period, on at least one button among the plurality of buttons while electric power is being supplied to the driving system and the second controller is operated in a normal operation mode, in which each time the power button is pressed the power is alternately turned on and off, the second controller is configured or programmed to prohibit the power from being turned off.