Input device and control method

A control method of an input device, the input device including:

• a surface layer;
• a design portion disposed on a side of a front surface or a side of a back surface of the surface layer;
• a cushion layer disposed on the side of the back surface of the surface layer and having a void in the cushion layer;
• a frame in a plate shape disposed on a side of the cushion layer which is opposite to a side of the cushion layer where the surface layer is located;
• a main body that movably holds the frame in a direction, in which the surface layer and the frame are stacked, when the surface layer is pressed;
• a push-in detector that is mechanically connected to the frame;
• and
• a light source for illuminating the design on a side of the frame opposite to the cushion layer,
• wherein the design portion includes a first portion in which a design is disposed and a second portion in which the design is not disposed in a plan view, and
• each of the surface layer and the cushion layer extends across each of the first portion and the second portion in the plan view,
• the control method comprising:
• determining that a result of detecting by the push-In detector when the light source is lit and the first portion is operated is a valid detection result, and determining that a result of detecting by the push-in detector when the light source is not lit is an invalid detection result.