Suitcase convenient to on go downstairs

The utility model discloses a suitcase convenient to on go downstairs, it includes the box, the pull rod, the wheel is installed to the pull rod bottom, and the wheel is walked in the recess of rotating the board, and by turns the board be two parallels and just forms through relative, width of two concave surfaces and the same semicircular groove smooth connection of above -mentioned groove phase to the same strip -shaped groove of, size. The beneficial effect of the utility model: no matter be the walking on surface irregularity's way, or on the step, the board can be taken on the road surface all the time by turns, or between two steps, realizes the smooth transition to because the rotation of interior wheel, thus the oppression by turns the board constantly overturn walking around realizing.