NEGATIVE ELECTRODE ACTIVE MATERIAL FOR A LITHIUM ION SECONDARY BATTERY AND PRODUCTION METHOD FOR SAME, AND NEGATIVE ELECTRODE AND LITHIUM ION SECONDARY BATTERY

A negative electrode active material for a lithium ion secondary battery, the negative electrode active material including a porous carbon, wherein, in the porous carbon, a pore having a diameter of 20 nm to 1 μm is formed in the surface of a carbon matrix and a nanopore communicating with the pore and having a diameter of 15 nm or smaller is formed inside the carbon matrix.