An LIBS-type object sorting device includes a three-dimensional-shape measurement means that acquires a space-coordinate group of a top face of an object to be sorted in top view on a conveyor, an LIBS analyzing means that performs chemical composition analysis on the object to be sorted while irradiating the object to be sorted with laser light, and a conveying-path switching means that switches a conveying path of the object to be sorted, in this order. The device includes a computing means that determines an analyzing section on which the LIBS analysis is to be performed, and a control means that causes a beam position to move and causes, when detecting that the analyzing section has reached from a movement amount of the conveyor, based on the movement amount, a beam-focus position to move along the analyzing section while irradiating the laser light.