A trajectory generation system includes a computing unit that generates a trajectory on which a mobile body or a gripper moves from a start position to a target position, and an evaluating unit that evaluates a plurality of trajectory candidates. The computing unit generates the trajectory candidates leading to a target area including the target position and its vicinity, with a plurality of degrees of freedom associated with predetermined grip conditions, within at least one of a range in which the candidates can be computed in a predetermined period, a range in which they can be computed in a predetermined processing amount, and a range in which a predetermined number of trajectory candidates can be computed. The evaluating unit conducts evaluation of the trajectory candidates generated, based on an evaluation item, and the computing unit generates the trajectory, using one trajectory candidate selected based on the evaluation.