A vehicle brake hydraulic pressure control unit includes a base body 1 incorporating therein a brake fluid flow path 1a and an electromagnetic valve 2 which is an assembled part assembled into a mounting hole portion 10A which is formed in the base body 1 in such a manner as to communicate with the flow path 1a. The built-in semiconductor package includes at least one second semiconductor chip mounted on a die pad, and the second semiconductor chip has a plurality of terminals. Next, a subscription corresponding to the registered event by a subscriber is accepted by the information broker, after which a platform neutral event is created that is then populated with event content which is then published to and received by the information broker. The outer portions of the device isolation structure comprise a material having an etching selectivity with respect to that of the inner portion. Inner wall surfaces of the case abut on both the collar parts of the bobbin and the partition walls from a direction intersecting both a direction in which the pair of partition walls oppose and the axial direction of the bobbin.