NOVELTY - An electroconductive aluminum paste comprises an aluminum powder, metal nanoparticles and an organic dispersion solvent. The aluminum powder and metal nanoparticles are paste-form compositions distributed in the organic dispersion solvent, where the average particle diameter of the aluminum powder is 1-5 mu m and the metal nanoparticles are 5-50 nm. The surface of the metal nanoparticles is coated using a coating-material. The coating-material comprises 10-18C aliphatic monocarboxylic acid and 8-14C aliphatic monoamine, or diamine.    USE - Electroconductive aluminum paste for forming an aluminum wiring layer, solar cell electrode and a joining material on a surface of an inorganic material substrate.    ADVANTAGE - The electroconductive aluminum paste improves the adhesiveness with respect to the substrate surface of the aluminum wiring layer without utilizing glass frit, and suppresses the variation in the thickness of the aluminum wiring layer and the electrode layer, and a surface unevenness.    DETAILED DESCRIPTION - An electroconductive aluminum paste comprises an aluminum powder, metal nanoparticles, and an organic dispersion solvent. The aluminum powder and metal nanoparticles are paste-form compositions distributed in the organic dispersion solvent, where the average particle diameter of the aluminum powder is 1-5 mu m and the metal nanoparticles are 5-50 nm. The surface of the metal nanoparticles is coated using a coating-material. The coating-material comprises 10-18C aliphatic monocarboxylic acid and 8-14C aliphatic monoamine, or diamine and which has affinity with respect to the organic dispersion solvent, where the organic dispersion solvent is a nonpolar organic solvent having a boiling point of 150-350 degrees C per 100 mass parts of the aluminum powders, and the content of the metal nanoparticles are 100-230 mass parts, the organic dispersion solvent is 15-35 mass parts, and the coating-material is 8-15 mass parts per 100 mass parts of the metal nanoparticles.