Prophylactic or therapeutic agent for arthritis

A prophylactic or therapeutic agent for arthritis, comprising a plant of a plant belonging to the family Saxifragaceae or an extract of the plant as an active ingredient, a plant of a plant belonging to the family Saxifragaceae or an extract of the plant. A method for preventing or treating arthritis in an animal, wherein the method comprises preventing the animal from ingesting the food or drink, or the agent for preventing or treating arthritis, or a method for preventing or treating arthritis in an animal; The present invention relates to a food or drink or feed for preventing or treating arthritis, which comprises an extract as an active ingredient.