The object of the present invention is to find a new application of isopropyl (6-{ [4-(pyrazol-1-yl)benzyl] (pyridin-3-ylsulfonyl)aminomethyl}pyridin-2-ylamino)acetate or a salt thereof. Isopropyl (6-{ [4-(pyrazol-1-yl)benzyl] (pyridin-3-ylsulfonyl) aminometh yl}pyridin-2-ylamino) acetate or a salt thereof is useful as a therapeutic agent for a disease involving a greatly elevated intraocular pressure.