SEMICONDUCTOR STORAGE DEVICE

A device includes a first region including first semiconductor pillars extending through first conductive layers; a second region including second semiconductor pillars extending through second conductive layers; and a third region disposed between the first region and the second region and including insulator columns extending through third conductive layers. The third region includes a fourth region and a fifth region. In the fourth region, one third conductive layer electrically connects one first conductive layer and one second conductive layer to each other, and in the fifth region, one third conductive layer is connected to a contact plug. A first diameter of a first subset of the insulator columns provided in the fourth region is smaller than a second diameter of a second subset of the insulator columns provided in the fifth region.