In this paper, I propose a japanese categorial grammar JCG which gives a foundation of semantic parsing of Japanese. JCG is not an orthodox categorial grammar with functional application, composition etc., but a hybrid system with HPSG based on term and sentence which correspond to the nominal head and verbal head in HPSG respectively. Construction rules of JCG are designed so as to be used as parsing rules of Japanese, but at the same time, they give the semantic correspondence of the japanese

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... expressions via the homomorphism between syntax and semantics. The semantic output as such is a higher-order logical expression, but it's reduced to a Horn clause expression in its final form that constitutes a logic database on which a logical inference is executed.