To provide an electronic control device capable of suppressing leakage of radio-frequency radiation noise, radiated from a noise source, to the outside.
The electronic control device includes a radio-frequency circuit 104 at least a part of which is driven at a radio frequency, a printed circuit board 101 on which a low-frequency circuit 103 that is driven at a low frequency is mounted, a housing 100 made of metal that includes therein the printed circuit board 101 together with the radio-frequency circuit 104 and the low-frequency circuit 103, a plurality of radio-frequency connectors 106a to 106f for transmitting and receiving signals related to the radio-frequency circuit 104 mounted on the printed circuit board 101 to and from the outside of the housing, a low-frequency connector 105 for transmitting and receiving signals related to the low-frequency circuit 103 mounted on the printed circuit board 101 to and from the outside of the housing, and a partition wall 203 for suppressing propagation of radiation noise, radiated by driving the radio-frequency circuit 104, to the low-frequency connector 105.