PURPOSE: To provide a belt conveyor device for aggregate transfer which does not require equipment for special dehydrating processing and its processing time.

CONSTITUTION: Vibration applying parts 25 or the like are arranged on outer peripheral surfaces of carrier rollers 17 and 18, and vibration reciprocating in the direction almost perpendicular to a belt surface of a conveyor belt 15 is applied to the belt 15. Excessive moisture sticking to a thin aggregate 12 oozes out to both side inclined face parts of the cross-sectional angle-shaped thin aggregate 12 by vibration applied to the thin aggregate 12 at transfer time by the belt conveyor 15, and these both side inclined face parts are scraped away from the belt 15 by a pair of blads 30.