To certainly detect an article placed on a seat cushion while preventing the article from being falsely detected as an occupant even when the occupant sits at any position or any angle.
Right and left weight sensors 13R and 13L of a front weight sensor group 13 arranged on the upper face of the seat cushion are interconnected, and right and left weight sensors 14R and 14L of a rear weight sensor group 14 are interconnected, and the right and left weight sensors 13R and 13L of the front weight sensor group 13 are connected to the right and left weight sensors 14R and 14L of the rear weight sensor group 14. The interval Fo between lateral outer ends of the right and left weight sensors 13R and 13L of the front weight sensor group 13 is set narrower than the interval Ro between lateral outer ends of the right and left weight sensors 14R and 14L of the rear weight sensor group 14. The interval Fi between lateral inner ends of the right and left weight sensors 13R and 13L of the front weight sensor group 13 is substantially equal to the interval Ri between lateral inner ends of the right and left weight sensors 14R and 14L of the rear weight sensor group 14.
TERASAKI TSUTOMU
YOSHIFUKU MASATSUGU
KUMAKIRI NAOTAKA
KOJIMA MIKITO
OSHIRODA NOBUHIRO
ISHII TAKAHIRO
KAWAHIRA TETSUYA
FUJIKURA LTD
Kazuaki Niki