An electrode according to an embodiment contains an electrode mixture layer containing an active material and a conductive assistant. In a logarithmic differential pore volume distribution by a mercury intrusion method, the electrode mixture layer satisfies: a ratio P1/P2 within a range of 2 or more and less than 8, and a ratio S1/S2 within a range of 3 or more and less than 10. P1 is a value of a maximum logarithmic differential pore volume in a pore diameter range of 0.1 μm or more and 1 μm or less. P2 is a value of a logarithmic differential pore volume of a pore diameter of 0.03 μm. S1 is an integrated value in a pore diameter range of 0.1 μm or more and 1 μm or less. S2 is an integrated value in a pore diameter range of more than 0 μm and less than 0.1 μm.