The present invention relates to a roller assembly for a trolley conveyor that moves along a rail track including a flange and a web. The roller assembly for a trolley conveyor includes a pair of brackets that is placed respectively on both sides of the rail track, that has the shape of cranks corresponding to each other and that includes a mounting hole for installing a below-described shaft, a roller that is rotatably coupled to the upper end of the bracket so as to be mounted on the web and slide, and a shaft that penetrates the roller, that is coupled to the roller and that is inserted into and fixed to the mounting hole. The roller assembly with the configuration may have a simple structure, may be easily assembled and disassembled and may ensure durability.