The hepatoprotective agent contains eggshell membrane-containing fine powder, wherein the eggshell membrane-containing fine powder is eggshell membrane-containing fine powder having a volume mean particle diameter of 6 μm or less and/or eggshell membrane-containing fine powder having a volume maximum particle diameter of 20 μm or less. When fed with feed including eggshell membrane-containing fine powder with these values (sample C), the liver injury group (CCl4) caused a significant weight loss compared with the control group (control), but the test group ESM, the eggshell membrane-fed group (ESM) maintained the equal weight to the control group.
