An injection mold (1) may include: an outer block (100) that is mounted and fixed to an injection molding machine and divided into an upper mold (110) and a lower mold (120), an inner block (200) composed of an upper block (230) and a lower block (220) that are replaceably mounted on the upper mold (110) and the lower mold (120), respectively; a metal core (300) mounted in the inner block (200) and has a cavity (310) for forming a molded product (10) with a molded portion having a size of tens to hundreds of micrometers; an ejector (400) coupled to the inner block (200) and removes the molded product (10) in the cavity (310) by moving straight; a driving unit (500) disposed inside the lower mold (120) is moved up/down by hydraulic pressure or pneumatic pressure supplied from the outside, and drives the ejector (400).