To provide a structure which can easily be adhesion joined without using a binder (containing an adhesive), also is excellent in an adhesion bondability in which a concave shape of a joining surface is maintained as it is, and then is excellent in flowing performance of a fluid when forming a passage.

A content of a polypropylene based resin in a synthetic resin composition is 70-30 mass%, the content of a hydrogen addition derivative is 30-70 mass%, and the surface of the structure forms a microdomain without miscibility of a polymer block X with a PP phase to provide a structure in which a polymer block Y is miscible with an amorphous region part of the PP phase. As estimation of the flowing performance, a flowing tip of an ink is the concave shape when the ink is poured into the passage, flows in naturally in atmospheric pressure, and an injection molded product consisting of the synthetic resin composition is excellent in adhesion bondability (wherein, X is the polymer block immiscible with the polypropylene based resin, and Y is an elastomeric polymer block of a conjugate diene.).

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