A negative electrode active material for a non-aqueous electrolyte secondary battery, comprising: negative electrode active material particles that contain a silicon compound (SiO x : 0.5 ≤ x ≤ 1.6) containing a Li compound; wherein the silicon compound is at least partially coated with a carbon coating, the negative electrode active material particles are coated with a coating composed of at least one compound selected from the group consisting of a compound having a boron-fluorine bond and a compound having a phosphorous-fluorine bond, with the coating being contained on at least a part of a surface of either or both of the silicon compound and the carbon coating, the silicon compound has a median size of 0.5 μm or more and 20 μm or less, the negative electrode active material particles contain a boron element or a phosphorous element in a range of 10 ppm by mass to 10000 ppm by mass, preferably in a range of 500 ppm by mass to 5000 ppm by mass, with respect to a total amount of the negative electrode active material particles, and the negative electrode active material particles contain at least one selected from the group consisting of an alkali metal, an alkaline earth metal, and a salt thereof; wherein the negative electrode active material particles contain at least one selected from the group consisting of sodium, potassium, and a salt thereof as the alkali metal, and the sodium element or the potassium element is contained in a range of 10 ppm by mass to 200 ppm by mass on an individual basis with respect to the total amount of the negative electrode active material particles, and/or wherein the negative electrode active material particles contain at least one selected from the group consisting of magnesium, calcium, and a salt thereof as the alkaline earth metal, and the magnesium element or the calcium element is contained in a range of 5 ppm by mass to 50 ppm by mass with respect to the total amount of the negative electrode active material particles. negative electrode active material particles that contain a silicon compound (SiO x : 0.5 ≤ x ≤ 1.6) containing a Li compound; wherein the silicon compound is at least partially coated with a carbon coating, the negative electrode active material particles are coated with a coating composed of at least one compound selected from the group consisting of a compound having a boron-fluorine bond and a compound having a phosphorous-fluorine bond, with the coating being contained on at least a part of a surface of either or both of the silicon compound and the carbon coating, the silicon compound has a median size of 0.5 μm or more and 20 μm or less, the negative electrode active material particles contain a boron element or a phosphorous element in a range of 10 ppm by mass to 10000 ppm by mass, preferably in a range of 500 ppm by mass to 5000 ppm by mass, with respect to a total amount of the negative electrode active material particles, and the negative electrode active material particles contain at least one selected from the group consisting of an alkali metal, an alkaline earth metal, and a salt thereof; wherein the negative electrode active material particles contain at least one selected from the group consisting of sodium, potassium, and a salt thereof as the alkali metal, and the sodium element or the potassium element is contained in a range of 10 ppm by mass to 200 ppm by mass on an individual basis with respect to the total amount of the negative electrode active material particles, and/or wherein the negative electrode active material particles contain at least one selected from the group consisting of magnesium, calcium, and a salt thereof as the alkaline earth metal, and the magnesium element or the calcium element is contained in a range of 5 ppm by mass to 50 ppm by mass with respect to the total amount of the negative electrode active material particles. <EOS>