A method for producing a negative electrode active material for a lithium ion secondary battery including a silicon-titanium oxide composite, comprising: obtaining the silicon-titanium oxide composite by coating a titanium oxide to a silicon oxide; obtaining the silicon oxide by heating polysilsesquioxane, hereinafter referred to as PSQ, having a structure of the following formula under a non-oxidizing atmosphere, wherein the silicon oxide is represented by a general formula SiOxCyHz, wherein 0.5<x<1.8, 0≤y<5, 0≤z<0.4, and the PSQ is obtained by at least one type of silicon compound that is subjected to a hydrolysis and polycondensation reaction; and performing a heat treatment under a reducing gas atmosphere after the titanium oxide is applied to the silicon oxide, in the formula, R 1 and R 4 each are independently a group selected from among a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 45 carbon atoms, a substituted or unsubstituted aryl group, and a substituted or unsubstituted arylalkyl group, and here, in the alkyl group having 1 to 45 carbon atoms, any hydrogen atom is optionally substituted with a halogen atom, any -CH 2 - is optionally substituted with -O-, -CH=CH-, a cycloalkylene group, or a cycloalkenylene group in a range in which the number of carbon atoms in the group does not exceed 45, and in the alkylene group in the substituted or unsubstituted arylalkyl group, any hydrogen atom is optionally substituted with a halogen atom, and any -CH 2 - is optionally substituted with -O-, -CH=CH-, or a cycloalkylene group in a range in which the number of carbon atoms in the group does not exceed 45; R 2, R 3, R 5 and R 6 are independently a group selected from among a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 45 carbon atoms, a substituted or unsubstituted aryl group, and a substituted or unsubstituted arylalkyl group, and here, in the alkyl group having 1 to 45 carbon atoms, any hydrogen atom is optionally substituted with a halogen atom, any -CH 2 - is optionally substituted with -O-, -CH=CH-, a cycloalkylene group, a cycloalkenylene group, or -SiR 1 2 - in a range in which the number of carbon atoms in the group does not exceed 45, and in the alkylene group in the substituted or unsubstituted arylalkyl group, any hydrogen atom is optionally substituted with a halogen atom, and any -CH 2 - is optionally substituted with -O-, -CH=CH-, a cycloalkylene group, a cycloalkenylene group, or -SiR 1 2 - in a range in which the number of carbon atoms in the group does not exceed 45, and n is an integer of 1 or more. obtaining the silicon-titanium oxide composite by coating a titanium oxide to a silicon oxide; obtaining the silicon oxide by heating polysilsesquioxane, hereinafter referred to as PSQ, having a structure of the following formula under a non-oxidizing atmosphere, wherein the silicon oxide is represented by a general formula SiOxCyHz, wherein 0.5<x<1.8, 0≤y<5, 0≤z<0.4, and the PSQ is obtained by at least one type of silicon compound that is subjected to a hydrolysis and polycondensation reaction; and performing a heat treatment under a reducing gas atmosphere after the titanium oxide is applied to the silicon oxide, in the formula, R 1 and R 4 each are independently a group selected from among a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 45 carbon atoms, a substituted or unsubstituted aryl group, and a substituted or unsubstituted arylalkyl group, and here, in the alkyl group having 1 to 45 carbon atoms, any hydrogen atom is optionally substituted with a halogen atom, any -CH 2 - is optionally substituted with -O-, -CH=CH-, a cycloalkylene group, or a cycloalkenylene group in a range in which the number of carbon atoms in the group does not exceed 45, and in the alkylene group in the substituted or unsubstituted arylalkyl group, any hydrogen atom is optionally substituted with a halogen atom, and any -CH 2 - is optionally substituted with -O-, -CH=CH-, or a cycloalkylene group in a range in which the number of carbon atoms in the group does not exceed 45; R 2, R 3, R 5 and R 6 are independently a group selected from among a hydrogen atom, a substituted or unsubstituted alkyl group having 1 to 45 carbon atoms, a substituted or unsubstituted aryl group, and a substituted or unsubstituted arylalkyl group, and here, in the alkyl group having 1 to 45 carbon atoms, any hydrogen atom is optionally substituted with a halogen atom, any -CH 2 - is optionally substituted with -O-, -CH=CH-, a cycloalkylene group, a cycloalkenylene group, or -SiR 1 2 - in a range in which the number of carbon atoms in the group does not exceed 45, and in the alkylene group in the substituted or unsubstituted arylalkyl group, any hydrogen atom is optionally substituted with a halogen atom, and any -CH 2 - is optionally substituted with -O-, -CH=CH-, a cycloalkylene group, a cycloalkenylene group, or -SiR 1 2 - in a range in which the number of carbon atoms in the group does not exceed 45, and n is an integer of 1 or more.