To save time and labor for the work blocking a through hole by a seal member by providing a seal body on an accelerator pedal bracket and covering and closing a wire through hole for wire type accelerator formed on a body panel with the seal body when it is attached on the body panel.

A spacer 6 is an integrated molding made of a resin and is an elliptic plate body. Each end part in the direction of major axis is provided on a plate face, and mounting holes 61, 62, 63 are provided in a central part having a stepped thin wall part, respectively. When a pedal bracket 2 is mounted, a bolt is inserted into a mounting hole 235 of a mounting plate 23, respectively, and these bolts 66 are screwed into a cap nut 67 on a rear surface of a dash panel P. At this time, a plate part 231 of the mounting hole 23 is positioned along a surface of a sound absorbing material M on the dash panel P by the spacer body 6. On the other hand, a seal body 7 fixed on the spacer body 6 closes a wire through hole P1 of the dash panel P due to the pressure- contact of a lip part 73 on outer periphery with a peripheral fringe of the wire through hole P1.