A miniature diamond anvil high‐pressure cell 42 mm in diameter, 18 mm thick, and 150 g in weight has been constructed. The cell is loaded into a piston–cylinder type pressing device with an alignment mechanism and compressed to a desired pressure. After the pressure is clamped by three screws, the cell part is taken out. Thereby, in spite of the small and simple cell, pressure can be generated easily and steadily up to 200 kbar. Because the cell is small and light enough to be mounted on a usual goniometer head, and has large openings towards both the top and bottom, it can widely be used as a versatile apparatus for research at high pressure.