To prevent an adhesive from being swollen out to a flow path thereof upon bonding and, at the same time, to obtain a large adhesive strength.

A substrate bonding method for bonding at least two sheets of substrates each having an opening part with the adhesive comprises: a step of applying a high-viscosity adhesive onto a surface of one substrate having the opening part, the surface being a bonding surface around the opening part of the one substrate, thereby forming protrusion parts around the opening part and applying a low-viscosity adhesive onto the surface of the substrate of a part other than the protrusion parts in such a manner that the height of the applied low-viscosity adhesive from the surface of the substrate becomes lower than the height of the protrusion part; and a step of adhering, to the one substrate on which the high-viscosity adhesive and the low-viscosity adhesive have been applied, the other substrate in such a manner that the other substrate first comes in contact with the protrusion parts formed by the high-viscosity adhesive and then the other substrate comes in contact with the low-viscosity adhesive.