An input device manufacturing method according to an aspect of the present invention includes a lamination step of preparing a first substrate formed from a flat plate of a translucent synthetic resin, a second substrate formed from a flat plate of a translucent synthetic resin, and a sensor film formed from a translucent resin film on which a translucent electrode is disposed, and holding the sensor film between the first substrate and the second substrate to form a flat multilayer body; and a bending step of bending the flat multilayer body into a curved multilayer body retaining a curved shape. Thus, the input device can secure sufficient adhesion between the substrates and the sensor film, and can retain high detection accuracy with the sensor film.