According to one embodiment, a semiconductor storage device includes a first cell, a second cell, a bit line, a first buffer, a second buffer, and a controller. The bit line transfers the data to the first cell and the second cell. The first buffer holds write data to the first cell and the second cell. The second buffer holds read data from the first cell. The controller controls first writing and rewriting executed for the first cell and second writing executed for the second cell. The write data in the first buffer is updated each time a second write signal is given. The controller executes the first writing based on the write data held by the first buffer. The controller performs the second writing based on the write data updated in the first buffer. The controller executes the rewriting based on the read data held by the second buffer.