Fuente: WIPO "tomato" Provided is a chip that enables a nucleic acid in a biological sample (in particular, a plant sample) to be detected with higher sensitivity.A nucleic acid detection chip includes an inorganic substrate and a nucleic acid probe, (x) the nucleic acid probe being linked via an amino group linked to the inorganic substrate and/or (y) the nucleic acid probe being linked by an amide bond between an amino group linked to the inorganic substrate and the nucleic acid probe that has an active ester group or a carboxy group.