Novel .beta.-type crystal of N-(3-chloro-1H-indol-7-yl)-4-sulfamoylbenzenesulfonamide of the formula: characterized in, for example, that in powder X-ray diffractometry, it has a diffraction peak at a diffraction angle (2.theta..+-.0.2.degree.) of 18.4.degree.. This crystal has favorable properties, such as high solubility in buffer solutions and various organic solvents, and is suitable to an active ingredient of a pharmaceutical composition for use as an antitumor agent, an activated lymphocyte suppressor or an eating enhancer.