An object of the present invention is to provide a protective agent for the keratoconjunctiva or a suppressive agent for a keratoconjunctival disorder having an excellent suppressive effect on a keratoconjunctival disorder. The invention relates to a protective agent for the keratoconjunctiva or a suppressive agent for a keratoconjunctival disorder containing glucosylglycerol as an active ingredient, use of glucosylglycerol for the manufacture of a pharmaceutical for protecting a keratoconjunctiva or suppressing a keratoconjunctival disorder and a method of protecting a keratoconjunctiva or suppressing a keratoconjunctival disorder comprising administering glucosylglycerol.