Provided is an input device including a sensor part to detect approaching states of objects at detection positions and an adjacent region specification part to specify adjacent regions of the objects based on detection data from the sensor part. The adjacent region specification part specifies a peak detection position, of which a value of the detection data satisfies a certain peak condition among the detection positions, and conducts a label assigning process that assigns a label applied at the peak detection position to one or more detection positions among surrounding detection positions of the peak detection position. The label is not assigned to the one or more detection positions, and the detection data of the one or more detection positions indicate greater than or equal to a first threshold defined based on the detection data of the peak detection position being specified.