A contactless power supply device comprising: a main body case at least partially covering a main body part including an electric unit; a handle attachable and detachable with respect to the w main body case a power transmission module to be provided to protrude from the main body case, and having a power transmission coil electrified based on power supplied to the main body part; a power reception module housed in the handle to face the power transmission module when the handle is fixed to the main body case, and having a power reception coil contactlessly supplied with power via the power transmission coil; and a detection unit provided in the handle, driven based on the power supplied via the power reception module, and configured to detect whether the handle is being gripped, the power transmission module acquiring detection information indicating a detection result of the detection unit in response to the contactless power supply, and outputting, to the electric unit, a control signal for controlling driving of the electric unit based on the detection information, characterized in that the handle is configured to be fixed to the main body case by screwing a screw part provided in the handle into a screw hole part provided in the main body case, the screw part is provided in a central portion of the power reception coil and a power reception board included in the power reception module, as viewed in an axial direction of the screw part, and the screw hole part is provided in a central portion of the power transmission coil and a power transmission board included in the power transmission module, as viewed in an axial direction of the screw hole part. a main body case at least partially covering a main body part including an electric unit; a handle attachable and detachable with respect to the w main body case a power transmission module to be provided to protrude from the main body case, and having a power transmission coil electrified based on power supplied to the main body part; a power reception module housed in the handle to face the power transmission module when the handle is fixed to the main body case, and having a power reception coil contactlessly supplied with power via the power transmission coil; and a detection unit provided in the handle, driven based on the power supplied via the power reception module, and configured to detect whether the handle is being gripped, the power transmission module acquiring detection information indicating a detection result of the detection unit in response to the contactless power supply, and outputting, to the electric unit, a control signal for controlling driving of the electric unit based on the detection information, characterized in that the handle is configured to be fixed to the main body case by screwing a screw part provided in the handle into a screw hole part provided in the main body case, the screw part is provided in a central portion of the power reception coil and a power reception board included in the power reception module, as viewed in an axial direction of the screw part, and the screw hole part is provided in a central portion of the power transmission coil and a power transmission board included in the power transmission module, as viewed in an axial direction of the screw hole part.