A leakage of electromagnetic waves is suppressed effectively on the periphery of a heat radiating device. A heat radiating device (80) includes a plurality of fins (81) that are arranged on the inside of an opening (52a), a heat pipe (83) that includes a connecting portion (83a) being located between the plurality of fins (81) and a circuit board (50) and extending in a left-right direction along the circuit board (50), and a base plate (82) that supports the plurality of fins (81). The base plate (82) includes a plate left portion (82c). The plate left portion (82c) covers a lower surface of the heat pipe (83), the lower surface facing a side of a board shield (52), and closes a gap (G1) between a left end of the plurality of fins (81) and a left edge of the opening (52a) of the board shield (52).