The working support robot system of the present invention includes: a robot arm (11); a measuring unit (12) for measuring the worker's position; a work progress estimation unit (13) for estimating the work progress based on data input from the measuring unit (12) while referring to data on work procedure, and for selecting objects necessary for the next task when the work is found to have advanced to the next procedure; and an arm motion planning unit (14) for planning the trajectory of the robot arm (11) to control the robot arm (11) based on the work progress estimated by the work progress estimation unit (13) and selected objects. The working support robot system can deliver objects such as tools and parts to the worker according to the work to be performed by the worker.