A handle device includes an operation handle which is assembled to a door and serves as a handle during an opening/closing operation of the door, and a sensor electrode which is provided in the operation handle and which is configured to detect a change in capacitance in response to contact or approach of a human body to a detection region set on a surface of the operation handle. The surface of the operation handle includes the detection region and a decoration region surrounding all or a part of a periphery of the detection region. The detection region is electrically insulated from the decoration region, and the sensor electrode is disposed on a back surface of a substrate which is a part of the surface of the operation handle.