the connector 125 is movable within the connector fitting hole 120a through the resilient support members 124 and the insulating plate 123 similarly terminals not shown connected respectively to the corresponding tabs 122a of the bus bars 122 are provided within the fuse block 126 and by fitting these terminals respectively on these tabs 122a the fuse block 126 is mounted or held on the insulating plate 123 similarly the harness connector 127 has terminals not shown connected respectively to the corresponding tabs 122a of the bus bars 122 and by fitting these terminals on these tabs 122a the harness connector 127 is mounted or held on the insulating plate 123 a connector 130 secured to an end of the wire harness 111 mounted on the instrument panel 110 is fitted in and connected to the harness connector 127 the electric connection box 115 fixed to the body panel 114 comprises an upper case 132 and a lower case 133 a bus bar 134 constituting an internal circuit is mounted within a space formed by cases 132 and 133 a first collective connecting connector portion 136 for fitting connection to the collective connecting connector 125 of the movable type electric connection box 112 is formed on an upper surface of the upper case 132 female terminals 139 fitted respectively on corresponding tabs of the bus bar 134 are mounted within the first collective connecting connector portion 136 and these female terminals 139 are respectively fitted on and electrically connected to the male terminals 129 in the collective connecting connector 125 of the movable type electric connection box 112 brackets 137 are formed respectively on predetermined portions of an outer peripheral surface of the upper case 132 and the electric connection box 115 is.