To enable a rider to fully hold out by an inner wheel side of front wheels in traveling a bank in a tricycle wherein left and right front forks for rotatably supporting the left and right front wheels are arranged to vertically extend on both lateral sides of a handle post and rotatably supported to left and right side posts, and the center part of an upper link with both ends connected to the left and right side posts and the center part of a lower link with both ends connected to the left and right side posts are rotatably connected to the handle post.

The left and right side posts 29L, 29R are arranged inclining to diminish a space between both side posts 29L, 29R toward the upper part.