Abstract: An organosilicon compound is represented by the following formula (1TQ): in which M is a single bond or an optionally substituted alkylene group having 1 to 20 carbon atoms; the benzene ring optionally has a substituent; the vinyl group is attached to the benzene ring at any position; n is an integer of 3 or 4; and R is a hydrogen atom, a hydroxy group or an organic group, and an atom attached to Si is C in a case where R is an organic group.

Abstract: A resin concrete composition and its molded article are provided, the resin concrete, even with a reduced resin content, having an excellent flowability, which is an important property in a molding operation, and necessitating no shrinkage reduction agent, and the molded article having no cracks and being highly strong. The resin concrete composition comprises (A) a resin composition containing (a) an unsaturated polyester of an unsaturated acid, a di- and/or trialkylene glycol, and dicyclopentadiene and (b) a polymerizable unsaturated monomer, (B) an aggregate, and (C) a filler.