To provide a surface treatment method capable of easily and inexpensively giving an affinity and a liquid-repellent property relative to an adhesive to two different predetermined areas of a surface of a substrate, a manufacturing method for a liquid drop ejection head provided with the substrate applied with the treatment by the surface treatment method, a liquid drop ejection head manufactured by the manufacturing method, and a liquid drop ejection apparatus with a high reliability.

The surface treatment method of the present invention is a surface treatment method for giving the liquid-repellent property to a first area of the surface of the substrate and giving the affinity relative to the adhesive to a second area different from the first area, and is a surface treatment method having a step for preparing the substrate, and a step for bonding a first reactive group to the substrate by feeding a first compound having a first functional group having the liquid-repellent property and the first reactive group bonded to the substrate to the first area, and for bonding a second reactive group to the substrate by feeding a second compound having a second functional group having the affinity to the adhesive and the second reactive group bonded to the substrate to the second area.

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