To reliably detect approach or contact of an operating body such as a human finger even if the thickness of an operation panel of a resin or the like formed on a capacitive sensor is obliged to be greater than a predetermined value.

An electrode pad 20c for detecting approach or contact of an operating body is disposed on an undersurface of an operation panel 10 by an adhesive film 23. A part of a surface region of the operation panel 10 opposite to the region of the electrode pad 20c is provided with a recessed portion having a smaller thickness than the other region, and the recessed portion is embedded with a touch part 80c having a metal film formed by vacuum deposition on a surface of a resin material so as to provide such permittivity and conductivity as keeps a change in capacitance within a detection threshold in the absence of approach or contact of the operating body. When the operating body is in contact with the touch part 80c, the touch part 80c bridges the operating body and the electrode pad 20c for reliable detection of the contact of the operating body even if the operation panel 10 has a great thickness d2.