A method for manufacturing an absorption product includes a pre-processing step of decreasing a contact angle of a side of a first sheet, which has a plate shape and does not pass excretion, to a water by performing corona treatment on the first sheet, and a sensing pattern forming step of forming a sensing pattern that can transmit and receive a sensing signal indicating the excretion by printing or coating a conductive ink containing water on a side of the first sheet increased in hydrophilicity through the corona treatment.
