According to one embodiment, there is provided a memory system including a 1st memory group, a 2nd memory group, a power supply voltage adjustment circuit, a 1st line, a 1st switch, a 2nd line, a 3rd line, and a 4th line. The power supply voltage adjustment circuit includes a 1st terminal and a 2nd terminal. The 1st line electrically connects the 1st terminal to the 1st memory group. The 1st switch includes a 3rd terminal, a 4th terminal, and a 5th terminal. The 1st switch electrically connects the 3rd terminal to the 4th terminal when turned on. The 2nd line electrically connects the 1st terminal to the 3rd terminal. The 3rd line electrically connects the 4th terminal to the 2nd memory group. The 4th line electrically connects the 2nd terminal to the 5th terminal.