A storage device includes a box-shaped case having an opening; an opening/closing body opening and closing the opening; a guide device extended along a predetermined straight line on a side wall of the case; a slider supported in the guide device slidably along the straight line; an arm extending from the opening/closing body, supported in the slider rotatably around a predetermined axis line, and having a first gear around the axis line; and a rack extended in the side wall parallel to the straight line, and engaged with the first gear. When the opening/closing body rotates around the axis line relative to the case, the first gear and the rack are engaged with each other so that the opening/closing body moves along the straight line together with the slider.