Provided is an input detection device capable of suppressing a change in detection sensitivity depending on a position. The input detection device includes: signal wirings having end portions, and arranged so as to extend in a first direction; drive electrodes each extending in a second direction crossing the first direction, and arranged in parallel to the first direction; a plurality of first switches arranged between the end portions of the drive electrodes and the signal wirings; a drive signal circuit supplying a drive signal to the end portions; and a selection circuit controlling the first switches in detecting proximity of an external object. When the proximity of the external object is detected based on a magnetic field from the external object, the number of the first switches electrically connecting the drive electrodes close to the end portions to the signal wirings is smaller than the number of the first switches electrically connecting the drive electrodes away from the end portions to the signal wirings.