A touch pad device includes: an operating unit which includes an operation surface on which an operating body performs a proximity operation, and an illumination portion disposed in the operation surface; a first substrate which has a first surface and a second surface, the first surface being aligned with the operation surface and provided with a detection unit that detects the proximity operation; and a support member configured to integrally support the operating unit and the first substrate, in which the first substrate is provided so as not to overlap the illumination portion, a light source disposed in the vicinity of the illumination portion and outputs light toward the support member side is provided, and a reflective portion configured to reflect the light output from the light source toward the illumination portion is provided at a position that opposes the light source of the support member.