A process for producing an indium hydroxide powder that has excellent evenness in particle diameter and a narrow particle-size-distribution width is provided in which the temperature and pH of a liquid between the electrodes are inhibited from increasing. The process for indium hydroxide powder production comprises using multiple anodes constituted of indium metal and multiple cathodes to conduct electrolysis in an electrolytic solution, thereby yielding an indium hydroxide powder, wherein the cathodes used in the electrolysis each have a main surface part having a net shape.
