An electric twist-grip operating device is basically provided with a base member and a switch unit. The base member is configured to be mounted around a bicycle handlebar. The switch unit is configured to output a first control signal to control a bicycle apparatus including at least one of a height adjustable seatpost and a suspension, the switch unit including a rotary operating member rotatable with respect to the base member about a longitudinal axis of the bicycle handlebar, the switch unit being configured to output one of the first control signal and a second control signal in response to a movement of the rotary operating member, the second control signal being different from the first control signal.