A function driving apparatus of the present invention includes an acceleration sensor which detects acceleration components of a device in directions of x axis, y axis, and z axis which are orthogonal to each other, at every predetermined time interval; and a control section which transforms, at every predetermined time interval, the acceleration components detected by the acceleration sensor to polar coordinate components formed of an r component representing a distance from an origin of an xyz space, a θ component representing an angle formed with the x axis, and a φ component representing an angle formed with an xy plane including the x axis and the y axis, and drives a specific function of the device when a state in which the θ component and the φ component are within a predetermined set range continues for a predetermined time or longer.