Organic silicon compound and silane coupling agent containing same

[Problem] To provide a novel organic silicon compound that can be used for a silane coupling agent. [Solution] 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); R 1 and R 2 each independently represent a C 1-5 alkyl group; R 3 represents a hydrogen atom or a methyl group; R 4 and R 5 each independently represent a C 1-5 alkyl group; m, n, and p each independently represent an integer of 1 to 5; and q represents an integer of 1 to 3.)