An electronic device is equipped with a wireless unit board for transmitting and receiving a radio signal to and from external equipment, where an accommodation space for the wireless unit board is enclosed by a side plate of a casing of the electronic device, a first shield plate covering a circuit board, and a second shield plate holding a main control board thereupon and disposed substantially horizontally above the first shield plate. The wireless unit board is disposed in the accommodation space with one of opposed major surfaces thereof facing to the side plate of the casing.