Control device and vibration presenting apparatus

A control device that controls an electromagnetic actuator, the electromagnetic actuator driving an operation device in one direction of a vibration direction of the operation device to vibrate the operation device, the operation device being supported in an elastically vibratable manner by an elastic support part, wherein

• the control device includes a circuit, the circuit applying a main driving signal to a coil of the electromagnetic actuator to start vibration of the operation device in response to a touch operation on the operation device, the circuit then applying a sub-driving signal to the coil to adjust an attenuation period of the vibration,
• the sub-driving signal has a variable voltage, the variable voltage varying with an offset voltage as a center value, the offset voltage being offset from a zero voltage, a waveform that indicates a variation in the variable voltage being a sine function curve or a cosine function curve, and
• the circuit stops application of the offset voltage during at least one of a period between the main driving signal and the sub-driving signal and/or a period between a plurality of the sub-driving signals.