An agent device includes an agent functional controller configured to provide a service including causing an output device to output a response of voice in response to an utterance of an occupant of a vehicle, and a controller configured to permit an operation of a power window of the vehicle when a speed of the vehicle is less than a first threshold value and limit the operation of the power window of the vehicle when the speed of the vehicle is equal to or greater than the first threshold value when the agent functional controller is activated.