The semiconductor storage device of an embodiment includes a first conductive layer, a stack disposed above the first conductive layer and including a plurality of second conductive layers in a first direction, and a columnar body that extends in the first direction through the stack, and includes a semiconductor layer and a charge storage film provided between the plurality of conductive layers and the semiconductor layer. A first conductive layer out of the plurality of conductive layers is connected to the semiconductor layer, and the semiconductor layer includes a first region in which a concentration of an n-type impurity is higher than a concentration of a p-type impurity, a second region in which a concentration of a p-type impurity is higher than a concentration of an n-type impurity, and a third region contacted to the first conductive layer and disposed closer to the first region than the second region in the first direction.