To provide a novel organic silicon compound that can be used for a silane coupling agent. This organic silicon compound is represented by formula (1). (In the formula: A- represents formula (2) or formula (3) E represents formula (4) or formula (5) R1 and R2 each independently represent a C1-5 alkyl group R3 represents a hydrogen atom or a methyl group R4 and R5 each independently represent a C1-5 alkyl group m, n, and p each independently represent an integer of 1 to 5 and q represents an integer of 1 to 3.)本發明之課題為提供一種可使用於矽烷偶合劑之新穎有機矽化合物。解決課題之技術手段為提供一種下述式(1):(式中,A-表示為下述式(2)或式(3):,E表示為下述式(4)或式(5):,R1及R2各自獨立表示為碳原子數1至5之烷基,R3表示為氫原子或甲基,R4及R5各自獨立表示為碳原子數1至5之烷基,m、n及p各自獨立表示為1至5之整數,q表示為1至3之整數)所代表之有機矽化合物。