A nonaqueous electrolyte secondary battery negative electrode, comprising: a collector; and a negative electrode active material layer formed on the collector, wherein the negative electrode active material layer contains a carbon-based negative electrode active material, a silicon-based negative electrode active material, a conductive agent, and carboxymethyl cellulose or a salt thereof, the carboxymethyl cellulose or a salt thereof has a degree of etherification of 0.4 to 2.0, has a 2 mass% aqueous solution viscosity (at 25°C, with a B-type viscometer) of 1000 mPa·s or less, has a PVI value of 0.5 or less, and has a structural viscosity of 50 or more, wherein the PVI value is measured by the carboxymethyl cellulose or a salt thereof being used to prepare an aqueous solution having a viscosity of 10000 ± 500 mPa·s, the mixture covered with a wrap, left overnight in a 25°C thermostat, subsequently stirred fully with a glass stick, the viscosity measured at a rotation speed of 2 rpm using a BH-type viscometer and a NO. 5 rotor (η2), then measured at a rotation speed of 20 rpm (η20), based on these measured values, and the PVI value calculated by following the equation PVI* = η20/η2, wherein structural viscosity is measured by the carboxymethyl cellulose or a salt thereof being used to prepare an aqueous solution having a viscosity of 10000 ± 500 mPa•s, the mixture covered with a wrap, left overnight in a 25°C thermostat, subsequently the viscosity measured at 20 rpm using a BH-type viscometer and a NO. 5 rotor (ηM), then after stirring at 400 rpm for 10 minutes using a three-one motor, the viscosity measured at 20 rpm measured using a BH-viscometer and a NO. 5 rotor (ηm), and the structural viscosity calculated by following the equation structural viscosity (%) = (ηV - ηm) / ηM, a content of the carboxymethyl cellulose or a salt thereof is 4 mass% to 15 mass% relative to a total mass of the negative electrode active material layer, and a content of the silicon-based negative electrode active material is 3 mass% to 19 mass% relative to a total content of the carbon-based negative electrode active material and the silicon-based negative electrode active material. a collector; and a negative electrode active material layer formed on the collector, wherein the negative electrode active material layer contains a carbon-based negative electrode active material, a silicon-based negative electrode active material, a conductive agent, and carboxymethyl cellulose or a salt thereof, the carboxymethyl cellulose or a salt thereof has a degree of etherification of 0.4 to 2.0, has a 2 mass% aqueous solution viscosity (at 25°C, with a B-type viscometer) of 1000 mPa·s or less, has a PVI value of 0.5 or less, and has a structural viscosity of 50 or more, wherein the PVI value is measured by the carboxymethyl cellulose or a salt thereof being used to prepare an aqueous solution having a viscosity of 10000 ± 500 mPa·s, the mixture covered with a wrap, left overnight in a 25°C thermostat, subsequently stirred fully with a glass stick, the viscosity measured at a rotation speed of 2 rpm using a BH-type viscometer and a NO. 5 rotor (η2), then measured at a rotation speed of 20 rpm (η20), based on these measured values, and the PVI value calculated by following the equation PVI* = η20/η2, wherein structural viscosity is measured by the carboxymethyl cellulose or a salt thereof being used to prepare an aqueous solution having a viscosity of 10000 ± 500 mPa•s, the mixture covered with a wrap, left overnight in a 25°C thermostat, subsequently the viscosity measured at 20 rpm using a BH-type viscometer and a NO. 5 rotor (ηM), then after stirring at 400 rpm for 10 minutes using a three-one motor, the viscosity measured at 20 rpm measured using a BH-viscometer and a NO. 5 rotor (ηm), and the structural viscosity calculated by following the equation structural viscosity (%) = (ηV - ηm) / ηM, a content of the carboxymethyl cellulose or a salt thereof is 4 mass% to 15 mass% relative to a total mass of the negative electrode active material layer, and a content of the silicon-based negative electrode active material is 3 mass% to 19 mass% relative to a total content of the carbon-based negative electrode active material and the silicon-based negative electrode active material.