A slot die coater of the present disclosure includes a lower die block and an upper die block; a shim plate interposed between the lower die block and the upper die block to form a slot therebetween; and a manifold disposed in the lower die block, the manifold accommodating a coating solution, wherein the coating solution is delivered and coated on a substrate through an exit port in communication with the slot, and wherein the shim plate includes a plate-shaped member having an open portion which is cut in at least an area to determine a coating width of a coating layer coated on the substrate, and a structure protruding from the plate-shaped member and inserted into the manifold.