To provide a method for producing microfibrous cellulose capable of easily obtaining the microfibrous cellulose having a fiber width of 1-1,000 nm by mechanically defibrating cellulose fiber.

In the method for producing microfibrous cellulose, wood chips are turned into wood powders and the wood powders are subjected to chemical treatment and then miniaturization treatment, so that the microfibrous cellulose having the maximum fiber width of 1,000 nm or less is obtained. The microfibrous cellulose is obtained with a high yield by adjusting the electric conductivity difference of the cellulose suspension between before and after the miniaturization treatment to be 20 μS/cm or more.