To materialize a structure capable of fixing an infant seat in a center part in a second row seat divided into three parts having comparatively large width in both side parts and narrower width in a center part.

Vehicular seat rows Sr are disposed to be adjacent to each other in a vehicular width direction, and composed of a center seat 2 having width smaller than a lower anchor interval regulated as the ISO-FIX and both side seats 1 having larger width than that. The center seat 2 can move in a back-and-forth direction. When the center seat 2 is positioned in a front side, the lower anchor 40 can project out from a rear portion of the center seat 2 to both sides. In a state that the lower anchor 40 projects out, locking of the infant seat adhering to the so-called ISO-FIX can be engaged.